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ASUS PRIME B840M-K vs ASUS EX-B850M-V7-CSM

Real specs. Clear sources.Exact models · UK & US buying links

Compared products

YOUR FIRST CHOICE

ASUS PRIME B840M-K

UK manufacturer specification · PRIME B840M-K

Full product profile Official image

Exact model & source notes

PRIME B840M-K motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.

Specifications checked 17 Oct 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

WHAT DIFFERS

ChipsetAMD B840 ChipsetAMD B850 Chipset

The first of 8 verified differences, in the order listed below. Not a rating.

See the 8 verified differences

THE CONTENDER

ASUS EX-B850M-V7-CSM

UK manufacturer specification · EX-B850M-V7-CSM

Full product profile Official image

Exact model & source notes

EX-B850M-V7-CSM motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.

Specifications checked 17 Oct 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

PRIME B840M-K UK & US retailers

UK & US price history: no verified listing yet

EX-B850M-V7-CSM UK & US retailers

UK & US price history: no verified listing yet

Search links open retailer results, not a matched listing; eBay listings are checked daily. As an Amazon Associate I earn from qualifying purchases. As an eBay Partner, we may be compensated if you make a purchase.

THE DIFFERENCES, MADE VISIBLE

Visual facts

Differences first. Select a topic for its graphic, sources and conditions.

How to read this comparison

Manufacturer facts for the exact models shown. Not a quality rating or a test result.
“Different” means the known values differ, not that one is better.
Missing or conflicting evidence is marked and never counts as a difference. Source chips hold each fact’s sources and conditions.

SPECIFICATIONS SIDE BY SIDE7 topics

SELECTED TOPIC

01 / 07

Chipset

Different hardware. A chip name or generation does not quantify real-world performance.

ASUS PRIME B840M-KAMD B840 Chipset

Manufacturer specification

Source 1

ASUS EX-B850M-V7-CSMAMD B850 Chipset

Manufacturer specification

Source 1

Explore the full specifications

Plan the complete platform. Check the exact CPU-support list, required BIOS and memory validation before buying. PCIe generations and lane allocations can change with the processor. A socket match or slot count is not a guarantee that every component works together at its highest advertised setting.

WHAT CHANGES BETWEEN THEM?

Key differences

Full specifications ↓

8 verified differences, most decision-relevant first. 7 are also drawn in Visual facts above. 2 features are the same under different published names, grouped below. Missing information stays separate.

Chipset

In Visual facts

ASUS PRIME B840M-KAMD B840 Chipset

ASUS EX-B850M-V7-CSMAMD B850 Chipset

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Different hardware. A chip name or generation does not quantify real-world performance.

Memory type, slots and limit

In Visual facts

ASUS PRIME B840M-K2 x DIMM slots, max. 128GB, DDR5 Supports up to 8000+MT/s(OC) with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC Un-buffered DIMM* Dual channel memory architecture Supports AMD Extended Profiles for Overclocking (EXPO™) ASUS Enhanced Memory Profile (AEMP) * Max Manual Overclocking: Achievable with advanced BIOS configuration and potentially specialized hardware. Results may vary according to system components. * XMP/EXPO/AEMP Profiles: Rated memory module speeds require a BIOS performance profile setting. Results may vary according to system components and can be impacted when four DIMM slots are used. * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market. * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.

ASUS EX-B850M-V7-CSM2 x DIMM slots, max. 128GB, DDR5 Supports up to 8200+MT/s(OC) with Ryzen™ 9000 Series Processors, 9600+MT/s(OC) with Ryzen™ 8000 Series Processors, 8000+MT/s(OC) with Ryzen™ 7000 Series Processors, Non-ECC, Un-buffered DIMM* Dual channel memory architecture Supports AMD Extended Profiles for Overclocking (EXPO™) ASUS Enhanced Memory Profile (AEMP) * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market. * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

Storage interfaces and restrictions

In Visual facts

ASUS PRIME B840M-KTotal supports 2 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen™ 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) AMD Ryzen™ 8000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4/x2 mode)* AMD B840 Chipset 4 x SATA 6Gb/s ports * Specifications vary by CPU types.

ASUS EX-B850M-V7-CSMSupports 2 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen™ 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) AMD Ryzen™ 8000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)* AMD B850 Chipset 4 x SATA 6Gb/s ports AMD RAIDXpert2 Technology Ryzen™ 9000 Series Processors: RAID 0/1/5/10 Ryzen™ 8000 Series Processors: RAID 0/1 Ryzen™ 7000 Series Processors: RAID 0/1/10 * Specifications vary by CPU types.

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

Network interfaces and requirements

In Visual facts

ASUS PRIME B840M-K1 x Realtek® 2.5Gb Ethernet ASUS LANGuard

ASUS EX-B850M-V7-CSM1 x Realtek 5Gb Ethernet ASUS LANGuard

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

Expansion slots and restrictions

In Visual facts

ASUS PRIME B840M-KAMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 4.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B840 Chipset 1 x PCIe 3.0 x16 slot (supports x4 mode) * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/). ** Specifications vary by CPU types. - To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.

ASUS EX-B850M-V7-CSMAMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B850 Chipset 1 x PCIe 4.0 x16 slot (support x4 mode) * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/). ** Specifications vary by CPU types. - To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

Internal headers and connectors

In Visual facts

ASUS PRIME B840M-KFan and Cooling Related 1 x 4-pin CPU Fan header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C® ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin Front Panel System header

ASUS EX-B850M-V7-CSMFan and Cooling Related 1 x 4-pin CPU Fan header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C® ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x 10-1 pin System Panel header

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

Show 2 more verified differences

Rear-panel ports

In Visual facts

ASUS PRIME B840M-K4 x USB 5Gbps ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x HDMI™ port 1 x Realtek® 2.5Gb Ethernet port 3 x Audio jacks

ASUS EX-B850M-V7-CSM2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 1 x HDMI™ port 1 x Realtek 5Gb Ethernet port 3 x Audio jacks

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

USB ports and headers

ASUS PRIME B840M-KRear USB (Total 6 ports) 4 x USB 5Gbps ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports * USB Type-C® power delivery output: max. 5V/3A.

ASUS EX-B850M-V7-CSMRear USB (Total 8 ports) 2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports * USB Type-C® power delivery output: max. 5V/3A

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Check the exact configuration and source conditions for your use.

Same feature, different names (2)

The sources publish different names for the same feature. Both names and their sources are shown; they are not counted as differences.

Audio interfaces

ASUS PRIME B840M-KRealtek® 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.

ASUS EX-B850M-V7-CSMRealtek 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Both sources state the same feature under different published names. This is not a verified difference; check the exact feature you need.

Listed operating systems

ASUS PRIME B840M-KWindows 11, Windows 10 64-bit

ASUS EX-B850M-V7-CSMWindows® 11, Windows® 10 64-bit

Sources

ASUS PRIME B840M-K

Manufacturer specification

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification

ASUS EX-B850M-V7-CSM — official UK technical specifications

Both sources state the same feature under different published names. This is not a verified difference; check the exact feature you need.

Configuration & compatibility details (1)

CPU support and BIOS requirements

ASUS PRIME B840M-KAMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors* Supports up to AMD 170W CPU * Refer to https://www.asus.com/support/download-center/ for CPU support list. BIOS: 32MB (256Mb) Flash ROM, UEFI AMI BIOS

ASUS EX-B850M-V7-CSMAMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors* Supports up to AMD 170W CPU * Refer to https://www.asus.com/support/download-center/ for CPU support list. BIOS: 256 Mb Flash ROM, UEFI AMI BIOS

Sources

ASUS PRIME B840M-K

Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.

ASUS PRIME B840M-K — official UK technical specifications

ASUS EX-B850M-V7-CSM

Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.

ASUS EX-B850M-V7-CSM — official UK technical specifications

These descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.

2 shared fields have the same recorded value.

WHAT EACH CHOICE ASKS OF YOU

What it brings and what to check

ASUS PRIME B840M-K

What it brings

Published motherboard interfaces and configuration are available from the exact-model ASUS specification source.
Manufacturer source

What to check

Compatibility and maximum operating modes depend on the source’s stated hardware, firmware and connection requirements; manufacturer figures are not independent measurements.
Manufacturer source

ASUS EX-B850M-V7-CSM

What it brings

Published motherboard interfaces and configuration are available from the exact-model ASUS specification source.
Manufacturer source

What to check

Compatibility and maximum operating modes depend on the source’s stated hardware, firmware and connection requirements; manufacturer figures are not independent measurements.
Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

13 of 13 specifications Sources in each row

Source-backed specifications for ASUS PRIME B840M-K and ASUS EX-B850M-V7-CSM
Specification	ASUS PRIME B840M-K	ASUS EX-B850M-V7-CSM

CPU socket Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	AM5	AM5
ChipsetDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	AMD B840 Chipset	AMD B850 Chipset
Form factor and dimensions Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )	micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )
CPU support and BIOS requirementsDifferent Sources ASUS PRIME B840M-K Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor. ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor. ASUS EX-B850M-V7-CSM — official UK technical specifications	AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors* Supports up to AMD 170W CPU * Refer to https://www.asus.com/support/download-center/ for CPU support list. BIOS: 32MB (256Mb) Flash ROM, UEFI AMI BIOS	AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors* Supports up to AMD 170W CPU * Refer to https://www.asus.com/support/download-center/ for CPU support list. BIOS: 256 Mb Flash ROM, UEFI AMI BIOS
Listed operating systems Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	Windows 11, Windows 10 64-bit	Windows® 11, Windows® 10 64-bit

Memory type, slots and limitDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	2 x DIMM slots, max. 128GB, DDR5 Supports up to 8000+MT/s(OC) with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC Un-buffered DIMM* Dual channel memory architecture Supports AMD Extended Profiles for Overclocking (EXPO™) ASUS Enhanced Memory Profile (AEMP) * Max Manual Overclocking: Achievable with advanced BIOS configuration and potentially specialized hardware. Results may vary according to system components. * XMP/EXPO/AEMP Profiles: Rated memory module speeds require a BIOS performance profile setting. Results may vary according to system components and can be impacted when four DIMM slots are used. * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market. * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.	2 x DIMM slots, max. 128GB, DDR5 Supports up to 8200+MT/s(OC) with Ryzen™ 9000 Series Processors, 9600+MT/s(OC) with Ryzen™ 8000 Series Processors, 8000+MT/s(OC) with Ryzen™ 7000 Series Processors, Non-ECC, Un-buffered DIMM* Dual channel memory architecture Supports AMD Extended Profiles for Overclocking (EXPO™) ASUS Enhanced Memory Profile (AEMP) * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market. * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.

Storage interfaces and restrictionsDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen™ 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) AMD Ryzen™ 8000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4/x2 mode)* AMD B840 Chipset 4 x SATA 6Gb/s ports * Specifications vary by CPU types.	Supports 2 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen™ 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) AMD Ryzen™ 8000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)* AMD B850 Chipset 4 x SATA 6Gb/s ports AMD RAIDXpert2 Technology Ryzen™ 9000 Series Processors: RAID 0/1/5/10 Ryzen™ 8000 Series Processors: RAID 0/1 Ryzen™ 7000 Series Processors: RAID 0/1/10 * Specifications vary by CPU types.

Expansion slots and restrictionsDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	AMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 4.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B840 Chipset 1 x PCIe 3.0 x16 slot (supports x4 mode) * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/). ** Specifications vary by CPU types. - To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.	AMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B850 Chipset 1 x PCIe 4.0 x16 slot (support x4 mode) * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/). ** Specifications vary by CPU types. - To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.

USB ports and headersDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	Rear USB (Total 6 ports) 4 x USB 5Gbps ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports * USB Type-C® power delivery output: max. 5V/3A.	Rear USB (Total 8 ports) 2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports * USB Type-C® power delivery output: max. 5V/3A
Rear-panel portsDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	4 x USB 5Gbps ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x HDMI™ port 1 x Realtek® 2.5Gb Ethernet port 3 x Audio jacks	2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 1 x HDMI™ port 1 x Realtek 5Gb Ethernet port 3 x Audio jacks
Audio interfaces Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	Realtek® 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.	Realtek 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.

Network interfaces and requirementsDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	1 x Realtek® 2.5Gb Ethernet ASUS LANGuard	1 x Realtek 5Gb Ethernet ASUS LANGuard

Internal headers and connectorsDifferent Sources ASUS PRIME B840M-K Manufacturer specification ASUS PRIME B840M-K — official UK technical specifications ASUS EX-B850M-V7-CSM Manufacturer specification ASUS EX-B850M-V7-CSM — official UK technical specifications	Fan and Cooling Related 1 x 4-pin CPU Fan header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C® ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin Front Panel System header	Fan and Cooling Related 1 x 4-pin CPU Fan header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C® ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x 10-1 pin System Panel header

First product manufacturer source Second product manufacturer source

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ASUS EX-B850M-V7

CPU socket: AM5
Chipset: AMD B850 Chipset
Form factor and dimensions: micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )

Prices & product profile

ASUS PRIME B840M-K-CSM

CPU socket: AM5
Chipset: AMD B840 Chipset
Form factor and dimensions: micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )

Prices & product profile

ASUS B840M AYW GAMING WIFI

CPU socket: AM5
Chipset: AMD B840 Chipset
Form factor and dimensions: micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )

Prices & product profile

ASUS B850M-E AYW GAMING WIFI

CPU socket: AM5
Chipset: AMD B850 Chipset
Form factor and dimensions: micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )

Prices & product profile

Each record represents an explicitly checked model and configuration. Original import: 5 Sept 2026; this is not its verification date. This is not a list of current offers or a popularity ranking.