UK manufacturer specification · PRIME B550M-K
PRIME B550M-K motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.
Specifications checked 17 Oct 2026.
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Manufacturer specificationsGlobal manufacturer specification · PRIME B550M-K/CSM
PRIME B550M-K/CSM motherboard, identified in the ASUS Global 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.
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Missing information stays separate.
No verified changes in the shared fields shown here. This does not establish that the products are equivalent.
13 shared fields have the same recorded value.
| Specification | ASUS PRIME B550M-K | ASUS PRIME B550M-K/CSM |
|---|---|---|
CPU socket SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | AM4 | AM4 |
Chipset SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | AMD B550 Chipset | AMD B550 Chipset |
Form factor and dimensions SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | mATX Form Factor 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm ) | mATX Form Factor 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm ) |
CPU support and BIOS requirements SourcesASUS PRIME B550M-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 B550M-K — official UK technical specificationsASUS PRIME B550M-K/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 PRIME B550M-K/CSM — official Global technical specifications | AMD Socket AM4 for AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors* * Refer to www.asus.com for CPU support list. BIOS: 256 Mb Flash ROM, UEFI AMI BIOS | AMD Socket AM4 for AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors* * Refer to www.asus.com for CPU support list. BIOS: 256 Mb Flash ROM, UEFI AMI BIOS |
Listed operating systems SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | Windows 11, Windows 10 64-bit | Windows 11, Windows 10 64-bit |
Memory type, slots and limit SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | 4 x DIMM, Max. 128GB, DDR4 4866(OC)/4800(OC)/4600(OC)/4466(OC)/4400(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/4000(OC)/3866(OC)/3733(OC)/3600(OC)/3466(OC)/3400(OC)/3333(OC)/3200/3000/2933/2800/2666/2400/2133, Un-buffered Memory* Dual Channel Memory Architecture * ECC memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types. | 4 x DIMM, Max. 128GB, DDR4 4866(OC)/4800(OC)/4600(OC)/4466(OC)/4400(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/4000(OC)/3866(OC)/3733(OC)/3600(OC)/3466(OC)/3400(OC)/3333(OC)/3200/3000/2933/2800/2666/2400/2133, Un-buffered Memory* Dual Channel Memory Architecture * ECC memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types. |
Storage interfaces and restrictions SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | Supports 2 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA modes) AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA modes) AMD B550 Chipset M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes) 4 x SATA 6Gb/s ports | Supports 2 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA modes) AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA modes) AMD B550 Chipset M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes) 4 x SATA 6Gb/s ports |
Expansion slots and restrictions SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x16 mode) AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors 1 x PCIe 3.0 x16 slot (supports x16 mode) AMD B550 Chipset 2 x PCIe 3.0 x1 slots | AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x16 mode) AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors 1 x PCIe 3.0 x16 slot (supports x16 mode) AMD B550 Chipset 2 x PCIe 3.0 x1 slots |
USB ports and headers SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | Rear USB (Total 6 ports) 2 x USB 3.2 Gen 2 ports (2 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) Front USB (Total 6 ports) 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports | Rear USB (Total 6 ports) 2 x USB 3.2 Gen 2 ports (2 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) Front USB (Total 6 ports) 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports |
Rear-panel ports SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | 2 x USB 3.2 Gen 2 ports (2 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) 1 x D-Sub port 1 x DVI-D port 1 x HDMI™ port 1 x Realtek 1Gb Ethernet port 3 x Audio jacks 1 x PS/2 Keyboard/Mouse combo port | 2 x USB 3.2 Gen 2 ports (2 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) 1 x D-Sub port 1 x DVI-D port 1 x HDMI™ port 1 x Realtek 1Gb Ethernet port 3 x Audio jacks 1 x PS/2 Keyboard/Mouse combo port |
Audio interfaces SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global 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 - LED-illuminated audio trace path design - 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 - LED-illuminated audio trace path design - 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 requirements SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | 1 x Realtek 1Gb Ethernet | 1 x Realtek 1Gb Ethernet |
Internal headers and connectors SourcesASUS PRIME B550M-K Manufacturer specification ASUS PRIME B550M-K — official UK technical specificationsASUS PRIME B550M-K/CSM Manufacturer specification ASUS PRIME B550M-K/CSM — official Global technical specifications | Fan and Cooling related 1 x 4-pin CPU Fan header 2 x 4-pin Chassis Fan headers Power related 1 x 24-pin Main Power connector 1 x 8-pin +12V Power connector Storage related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (AAFP) 1 x S/PDIF Out header 1 x Speaker header 1 x SPI TPM header (14-1pin) 1 x 10-1 pin System Panel header | Fan and Cooling related 1 x 4-pin CPU Fan header 2 x 4-pin Chassis Fan headers Power related 1 x 24-pin Main Power connector 1 x 8-pin +12V Power connector Storage related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (AAFP) 1 x S/PDIF Out header 1 x Speaker header 1 x SPI TPM header (14-1pin) 1 x 10-1 pin System Panel header |
Closest motherboards to this pair by shared key specifications. Not a popularity ranking.
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.
