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LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor, Dual Mode… competes with other Gaming Monitors products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full Gaming Monitors category for alternatives.

LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor, Dual Mode (QHD 540Hz/ HD 720Hz), 0.02ms, TrueBlack 500, NVIDIA G-Sync Compatible, AMD FreeSync Premium Pro, DP 2.1, USB-C, Black

Name: LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor, Dual Mode (QHD 540Hz/ HD 720Hz), 0.02ms, TrueBlack 500, NVIDIA G-Sync Compatible
Brand: Unbranded
SKU: B0G5R2QK24
Price: 679.99 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-07

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$679.99

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View Current Price on Amazon → Compare to similar gaming monitors

*Price sourced from Amazon.com. Last updated 2026-09-05. Price and availability subject to change.

Bottom line: The LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor, Dual Mode (QHD 540Hz/ HD 720Hz), 0.02ms, TrueBlack 500, NVIDIA G-Sync Compatible, AMD FreeSync Premium Pro, DP 2.1, USB-C, Black is a niche pick — read recent reviews before buying in the gaming monitors category, priced around $679.99. Compare close alternatives before committing.

The LG UltraGear OLED 27GX790B is built for gamers who want every visual and competitive advantage. UltraGear's 27-inch 4th Generation OLED QHD resolution display delivers pinpoint clarity with UL Verified Perfect Black and Perfect Color¹, exposing incredible detail and nuanced highlights. VESA DisplayHDR True Black 500 adds deeper contrast and controlled brightness, giving gamers a sharper read on enemies, environments, and effects in every gaming scenario.Speed is where this UltraGear OLED separates itself from others. Dual Mode² gives gamers two elite paths to victory: a 540Hz refresh…

SpecPicks Verdict

SpecPicks scored LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the gaming monitors category. Compare with similarly-priced alternatives in the gaming monitors category before committing. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.

Common buyer scenarios for gaming monitors of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

Outrageous Speed with LG's Brightest OLED Gaming Monitor - Experience the brightness and speed of 4th Gen OLED on a vivid 27" QHD display—engineered for ultra-smooth, tear-free gameplay. With a refresh rate up to 720Hz and lightning-fast 0.02ms response time, you’ll react faster, track every movement with precision, and outpace your opponents frame by frame with astounding brightness, clarity and speed.
Our Brightest, Boldest OLED Gaming Monitor - Powered by UltraGear’s latest OLED with Primary RGB Tandem tech, this is LG’s brightest OLED gaming monitor yet—reaching 335 nits typical brightness for clear visibility in bright scenes. Enhanced APL and reduced ABL keep critical visuals sharp during intense action, while UL Verified Perfect Black and DisplayHDR True Black 500 deliver deep contrast and pinpoint detail.
Next-Gen OLED Brilliance - 4th Gen Primary RGB Tandem OLED reaches 335 nits typical brightness while using less power than previous UltraGear OLED generations. The display's advanced 4-stack RGB structure delivers enhanced contrast, sharper detail, and color precision that stays consistent across every frame.
Dual Mode: QHD 540Hz for Detail or HD 720Hz for Speed - Dual Mode pushes gaming speed to the edge, letting you toggle between QHD resolution at 540Hz or HD at 720Hz from a hotkey. Gain outrageous speed and responsiveness for split-second decisions and competitive domination.
DisplayPort 2.1 Delivers Next-Gen Gaming Speed - DisplayPort 2.1 unlocks ultra-fast data speeds for stable, high-refresh gaming up to 720Hz. USB-C keeps your setup clean with single-cable output, and dual HDMI 2.1 ports connect seamlessly to today’s top consoles. More bandwidth. More clarity. More ways to win.
A Virtually Instantaneous 0.02 Response Time (GtG) - The ultra-fast 0.02 response time (GtG), reducing reverse ghosting and providing fast response time, lets you to enjoy a whole new gaming performance.

Full Specifications

Brand	LG
Color	Black
Shape	Flat
Brightness	335 candela_per_square_meter
Model Name	27GX790B-B.AUS
Resolution	QHD Wide 1440p
Color Gamut	99.5
Pixel Pitch	0.23
Screen Size	27 inches
Aspect Ratio	16:9
Connectivity	USB-C
Display Type	OLED
Model Number	27GX790B-B.AUS
Refresh Rate	720 hertz
Adaptive Sync	FreeSync Premium Pro, G-Sync Compatible
Response Time	0.02 milliseconds
Screen Finish	Matte
Built-In Media	Display Port 2.1 Cable, HDMI 2.1 Cable, Monitor, Power Cable
Contrast Ratio	1500000:1
Total Usb Ports	3

Ready to buy?

LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor, Dual Mode (QHD 540Hz/ HD 720Hz), 0.02ms, TrueBlack 500, NVIDIA G-Sync Compatible, AMD FreeSync Premium Pro, DP 2.1, USB-C, Black is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price on Amazon →

*Price sourced from Amazon.com. Last updated 2026-09-05. Price and availability subject to change.