Different gaming monitors do not mean the same thing by a large refresh number

Samsung’s Odyssey OLED G60SF advertises 500 Hz at QHD, while the 2026 LG UltraGear 27GX790B supports 540 Hz at QHD and a separate 720 Hz mode at lower HD resolution. LG’s earlier 27GX790A-B offers 480 Hz QHD. Those are manufacturer model specifications; none on their own tells you how much latency you will measure during a real game.

Frame delivery is the constraint

At 500 Hz, a fresh display scan can begin roughly every two milliseconds, but a computer that produces 150 unique frames per second cannot supply 500 new game states. Increasing refresh from 240 Hz may improve motion sampling and responsiveness in supported conditions, but the magnitude depends on frame delivery, input devices, synchronization, rendering queue and game engine. The highest mode can also require giving up resolution or other display features.

What to verify before purchasing

Distinguish native QHD operation from an HD high-speed mode; LG’s 720 Hz is not a claim for QHD. Check your graphics card, cable and supported timing format. Confirm whether the monitor runs VRR at the selected refresh, and whether black-frame insertion changes brightness or causes artifacts. Consider OLED static-content risk, text clarity and room brightness in non-esports use. If a game is GPU-limited at 4K, the strongest improvement may be a lower rendering resolution or better frame pacing, not a new screen.

A practical recommendation

For professional or highly competitive play where the game regularly reaches a correspondingly high frame rate, a QHD 500–540 Hz display can be rational. For mixed gaming, editing and office work, a 4K 240 Hz OLED or even a well-tuned 144–180 Hz IPS panel is often more useful. Pay for the performance you can actually feed and can see—not the largest printed figure.

Sources: Samsung G60SF, LG GX7, LG 480Hz model.

Source-attributed editorial overview, not a hands-on review. Research cutoff: 2026-10-23. Specifications can vary by model variant and software.