A 31.5-inch 4K IPS programming monitor supplied with a monitor arm, listing 130 mm height travel, ±275° swivel and 90° pivot, plus USB-C with 90 W charging and a KVM switch.
Specifications checked 26 Sept 2026.
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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 SIDE2 topics
SELECTED TOPIC
01 / 02
Manufacturer inputs and connections
Check the exact configuration and source conditions for your use.
LG 27UL550HDMI (YES(2ea)); DisplayPort (YES(1ea)); DP Version (1.4); Headphone out (3-pole (Sound Only))
Manufacturer specification · Literal manufacturer declarations; Yes, No, counts, versions and component/operating qualifiers are preserved. A missing row establishes no capability or absence. Manufacturer section: CONNECTIVITY. Source field: HDMI. Manufacturer section: CONNECTIVITY. Source field: DisplayPort. Manufacturer section: CONNECTIVITY. Source field: DP Version. Manufacturer section: CONNECTIVITY. Source field: Headphone out.
BenQ RD320UA2 × HDMI (v2.0); 1 × DisplayPort (v1.4); 1 × USB C(PowerDelivery 90W, DisplayPort Alt Mode, Data); 1 × USB Type-B Upstream (USB 3.2 Gen 1, 5 Gbps, Data only); 2 × USB Type-A Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 4.5W); 1 × USB Type-C Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 4.5W); 1 × USB Type-C Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 7.5W); headphone jack
Manufacturer specification · Manufacturer port counts and versions; the source device and cable must support the mode you want.
Match the monitor to the connection. Refresh limits depend on the input, cable and source device. Confirm the exact regional ports, stand adjustment and mount. Manufacturer response-time methods such as MPRT and GtG are different; neither the image nor these figures establish an independent motion or colour-quality test.
LG 27UL550HDMI (YES(2ea)); DisplayPort (YES(1ea)); DP Version (1.4); Headphone out (3-pole (Sound Only))
BenQ RD320UA2 × HDMI (v2.0); 1 × DisplayPort (v1.4); 1 × USB C(PowerDelivery 90W, DisplayPort Alt Mode, Data); 1 × USB Type-B Upstream (USB 3.2 Gen 1, 5 Gbps, Data only); 2 × USB Type-A Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 4.5W); 1 × USB Type-C Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 4.5W); 1 × USB Type-C Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 7.5W); headphone jack
Sources
LG 27UL550
Manufacturer specification · Literal manufacturer declarations; Yes, No, counts, versions and component/operating qualifiers are preserved. A missing row establishes no capability or absence. Manufacturer section: CONNECTIVITY. Source field: HDMI. Manufacturer section: CONNECTIVITY. Source field: DisplayPort. Manufacturer section: CONNECTIVITY. Source field: DP Version. Manufacturer section: CONNECTIVITY. Source field: Headphone out.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer screen diagonal
LG 27UL550Not verified
BenQ RD320UA31.5 in
Sources
LG 27UL550
The captured manufacturer specification table does not list an unambiguous manufacturer screen diagonal. No value is inferred. · Manufacturer specification
Manufacturer specification · 90 W from the USB-C port that also carries DisplayPort Alt Mode video and data. Downstream accessory ports supply less and are not laptop-charging ports.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
USB-C connection
LG 27UL550Not verified
BenQ RD320UAYes
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · The listed connections include USB-C or Thunderbolt. Video, data, upstream/downstream roles and charging power depend on the particular port.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Brightness Intelligence Gen2 (B.I. Gen2)
LG 27UL550Not verified
BenQ RD320UAYes
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · BenQ’s table lists “Brightness Intelligence Gen2 (B.I. Gen2): Yes”; the product page mentions it only as powering MoonHalo’s Auto Dimming and does not describe its effect on the screen.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Display daisy-chain configuration
LG 27UL550Not verified
BenQ RD320UAUSB C out (MST)
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · Multi-Stream Transport via the listed USB-C out port. BenQ notes that Mac and MacBook devices only support daisy chaining via Thunderbolt, that daisy chaining is not supported via HDMI or regular USB ports on any device, and that M1/M2 Macs connect only a single external display.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Low blue light mode
LG 27UL550Not verified
BenQ RD320UAYes
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · BenQ lists this as “Low Blue Light Plus”; the product page says it includes Circadian Mode, which automatically adjusts colour temperature through the day.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Maximum power
LG 27UL550Not verified
BenQ RD320UA220 W
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · Manufacturer power figure under the stated operating mode; real use, brightness, connected USB devices and charging load can differ.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Night Hours Protection (minimum brightness)
LG 27UL550Not verified
BenQ RD320UAYes
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · BenQ’s table lists “Night Hours Protection: Yes”; the product page describes minimum brightness technology for night hours and dark rooms, with ambient light detection and auto-switch. No minimum-brightness figure is published.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Specification market
LG 27UL550Not verified
BenQ RD320UAUK
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · BenQ UK specification table. BenQ’s US page for the same model was checked separately on 26 September 2026 (see research notes); plugs, bundled accessories and warranty can still differ by market.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Sleep-mode power
LG 27UL550Not verified
BenQ RD320UA<0.5 W
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · Manufacturer power figure under the stated operating mode; real use, brightness, connected USB devices and charging load can differ.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer dimensions and configuration basis
LG 27UL550Not verified
BenQ RD320UA471.0 - 601.0 × 714.6 × 477.6 mm (height × width × depth, with stand)
Sources
LG 27UL550
The manufacturer does not supply complete, unambiguous unit-labelled dimensions for the relevant product/components. Original declarations: none. Missing units or malformed component values are not guessed. · Manufacturer specification · The manufacturer does not supply complete, unambiguous unit-labelled dimensions for the relevant product/components. Original declarations: none. Missing units or malformed component values are not guessed.
BenQ lists 471.0 - 601.0x714.6x477.6 mm (height × width × depth). · Manufacturer specification · Manufacturer dimensions with the supplied stand; a height range shows the stand’s lowest and highest positions. Allow extra room for cables and movement.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Weight with stand
LG 27UL550Not verified
BenQ RD320UA11 kg
Sources
LG 27UL550
No source recorded for this side.
BenQ RD320UA
Manufacturer specification · BenQ lists “Net Weight” separately from “Net Weight (w/o Base)”, so this figure includes the supplied base; packaging excluded.
Manufacturer claims do not establish independently measured performance, current retailer stock or price. Unlisted specifications remain explicitly unknown.
USB-C carries video, data and 90 W, with MST daisy-chain output (not from Macs, which BenQ says daisy-chain only via Thunderbolt) and a 10 Gbps USB hub.
Source-backed specifications for LG 27UL550 and BenQ RD320UA
Specification
LG 27UL550
BenQ RD320UA
Manufacturer screen diagonalSources
LG 27UL550
The captured manufacturer specification table does not list an unambiguous manufacturer screen diagonal. No value is inferred. · Manufacturer specification
Manufacturer specification · BenQ’s table lists “Brightness Intelligence Gen2 (B.I. Gen2): Yes”; the product page mentions it only as powering MoonHalo’s Auto Dimming and does not describe its effect on the screen.
HDMI (YES(2ea)); DisplayPort (YES(1ea)); DP Version (1.4); Headphone out (3-pole (Sound Only))
2 × HDMI (v2.0); 1 × DisplayPort (v1.4); 1 × USB C(PowerDelivery 90W, DisplayPort Alt Mode, Data); 1 × USB Type-B Upstream (USB 3.2 Gen 1, 5 Gbps, Data only); 2 × USB Type-A Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 4.5W); 1 × USB Type-C Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 4.5W); 1 × USB Type-C Downstream (USB 3.2 Gen 2, 10 Gbps, power charging 7.5W); headphone jack
Manufacturer specification · The listed connections include USB-C or Thunderbolt. Video, data, upstream/downstream roles and charging power depend on the particular port.
Manufacturer specification · 90 W from the USB-C port that also carries DisplayPort Alt Mode video and data. Downstream accessory ports supply less and are not laptop-charging ports.
Manufacturer specification · Multi-Stream Transport via the listed USB-C out port. BenQ notes that Mac and MacBook devices only support daisy chaining via Thunderbolt, that daisy chaining is not supported via HDMI or regular USB ports on any device, and that M1/M2 Macs connect only a single external display.
Manufacturer dimensions and configuration basisSources
LG 27UL550
The manufacturer does not supply complete, unambiguous unit-labelled dimensions for the relevant product/components. Original declarations: none. Missing units or malformed component values are not guessed. · Manufacturer specification · The manufacturer does not supply complete, unambiguous unit-labelled dimensions for the relevant product/components. Original declarations: none. Missing units or malformed component values are not guessed.
BenQ lists 471.0 - 601.0x714.6x477.6 mm (height × width × depth). · Manufacturer specification · Manufacturer dimensions with the supplied stand; a height range shows the stand’s lowest and highest positions. Allow extra room for cables and movement.
425 × 714.6 × 88.6 mm (height × width × depth, without base)
Weight with standSources
LG 27UL550
No source recorded.
BenQ RD320UA
Manufacturer specification · BenQ lists “Net Weight” separately from “Net Weight (w/o Base)”, so this figure includes the supplied base; packaging excluded.
Manufacturer specification · Manufacturer power figure under the stated operating mode; real use, brightness, connected USB devices and charging load can differ.
Manufacturer specification · Manufacturer power figure under the stated operating mode; real use, brightness, connected USB devices and charging load can differ.
Manufacturer specification · BenQ lists this as “Low Blue Light Plus”; the product page says it includes Circadian Mode, which automatically adjusts colour temperature through the day.
Night Hours Protection (minimum brightness)Sources
LG 27UL550
No source recorded.
BenQ RD320UA
Manufacturer specification · BenQ’s table lists “Night Hours Protection: Yes”; the product page describes minimum brightness technology for night hours and dark rooms, with ambient light detection and auto-switch. No minimum-brightness figure is published.
Manufacturer specification · BenQ UK specification table. BenQ’s US page for the same model was checked separately on 26 September 2026 (see research notes); plugs, bundled accessories and warranty can still differ by market.
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.