Adapted from the KeyboardTester.click LG UltraGear 25G590B guide, published September 10, 2026. This is a source-based analysis: we have not measured, photographed, or gamed on a 25G590B unit. Manufacturer pages were rechecked September 11. The cover uses official LG product imagery; its on-screen game content is simulated by LG.
LG calls the 25G590B the world's first native 1000Hz Full HD gaming monitor. At its $999.99 US price, the buying question is whether that speed matters more to you than resolution, contrast, and screen size. LG's launch announcement establishes the launch price and the manufacturer's first-of-kind claim.
My assessment: this is specialist hardware for competitive players with very high, stable frame rates. For mixed gaming and desktop use, compare OLED and dual-mode alternatives before paying for the highest refresh-rate number.
A 1 ms frame period does not establish measured pixel performance
The arithmetic is straightforward: 1000 / 1000 Hz = 1 ms per refresh. LG's UK specification table also lists a 1 ms response time.
Those matching numbers deserve attention, but a manufacturer response rating is not a measurement of every transition or the panel's worst case. We cannot infer exact ghosting, overshoot, or refresh compliance from that number alone.
Blur Busters explains the distinction: GtG describes a pixel changing between colors; MPRT concerns how long that pixel remains visible. Different color transitions can take different times, and the quoted GtG figure can represent only part of the transition. Reducing one number does not automatically eliminate all visible blur.
For this monitor, the practical question is how quickly real transitions settle at your chosen overdrive and refresh settings. Look for measured response distributions, overshoot, and pursuit-camera results, rather than treating the 1 ms specification as either proof of perfection or proof that 1000Hz is ineffective. The original guide links TFTCentral's hands-on video for independent testing.
MBR Pro and VRR are separate choices on this model
LG's UK product-page footnote says: "AMD FreeSync™ Premium and NVIDIA G-SYNC® Compatible, are disabled when MBR Pro is enabled."
That is a model-specific restriction worth deciding around. Compare MBR Pro's motion appearance against ordinary VRR operation in the games you actually play. With MBR Pro enabled, do not expect FreeSync or G-SYNC to smooth variable frame delivery.
LG also says the 1100Hz overclock does not support FreeSync Premium, while G-SYNC compatibility is certified at 1000Hz. Its US product footnotes document those limits.
Check the PC and the price, not just the panel
LG lists Windows 11, DisplayPort 2.1, and an RTX 50-series or Radeon RX 9070/9060/7900-series GPU or newer for the maximum refresh mode. That supported connection does not guarantee a matching in-game frame rate.
Use your game's frame-time graph and actual matches to establish average performance and lows. Our PC bottleneck calculator is an estimate to help investigate a CPU/GPU pairing; it cannot certify that a particular game will sustain 1000 fps.
These were the LG US product-page price fields checked September 11, 2026:
| Monitor | Main trade-off | Listed USD price |
|---|---|---|
| 25G590B-B | 24.5-inch FHD IPS, native 1000Hz | $999.99 |
| 27GX790A-B | 27-inch QHD OLED, 480Hz | $649.99 |
| 27G850A-B | 27-inch dual-mode: 4K/240Hz or FHD/480Hz | $899.99 |
These are dated page listings, not checkout quotes or confirmation of stock. LG's structured offers marked all three out of stock when checked; verify the seller, local availability, final price, and return policy. The original article preserves its earlier historical price snapshots.
Five delivery-day checks, with the browser's limits in mind
- Refresh rate test: configure the desired rate in Windows, then compare the browser's observed frame delivery.
- Frame skipping test: photograph the pattern using the guide's camera method and look for repeated gaps.
- Monitor ghosting test: compare overdrive levels for trails and inverse-ghosting halos.
- FPS test: inspect browser frame pacing under a clean workload.
- Dead pixel sweep: inspect full-screen colors while the return window is open.
Browser callbacks pass through the OS, compositor, GPU driver, and browser. A low result alone cannot prove that a correctly configured 1000Hz panel is defective. These tools help investigate configuration and visible behavior; they do not certify panel scan-out, response time, input lag, or LG's laboratory ratings.
Buying verdict: consider the 25G590B if competitive motion performance is your priority and you can test its modes in your own setup. For mixed use, the extra resolution and image-quality benefits of the alternatives deserve equal weight.
The full KeyboardTester.click guide contains the broader specification table, buyer checklist, sources, and FAQ.
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