LG 27GP850-B Review: Ignore the HDR Badge
The default 1440p recommendation for years. The question is whether what it does better than cheaper rivals is something you will notice.
The LG 27GP850-B has been the default answer to “what 1440p monitor should I buy” for long enough that the question is no longer whether it is good — it is whether the things it does better than cheaper rivals are things you will actually notice.
This is a research-based buying guide, not a hands-on test. It is built from LG’s published specification and independent measurement reporting. Read our review standards.
The short answer
Buy it if you use the same screen for work and games and you care about colour. 98% DCI-P3 from a Nano IPS panel is a genuinely wide gamut, and the fully adjustable stand — tilt, height and pivot — is the kind of thing you only appreciate after a year of using one that does not adjust.
The HDR400 badge is the part to ignore. At 400 nits with no local dimming, this accepts an HDR signal but cannot display HDR with the contrast the format is built around.
What Nano IPS actually is
Nano IPS is LG’s name for an IPS panel with a layer of nanoparticles applied to the backlight, which absorbs unwanted wavelengths and narrows the colour output. The result is a wider gamut than a standard IPS panel of the same generation — here, 98% coverage of DCI-P3.
That matters in specific work. If you edit photos, grade video, or make decisions about brand colour that leave your desk, a wide-gamut panel is doing real work. If you write code and read documents, it is a nice-to-have that you will notice mostly in photographs and games looking richer.
The specification
| Specification | LG 27GP850-B |
|---|---|
| Panel size | 27 inches |
| Resolution | 2560 x 1440 (QHD) |
| Panel type | Nano IPS |
| Refresh rate | 165 Hz, overclockable to 180 Hz |
| Response time | 1 ms GtG |
| Brightness | 400 cd/m² |
| Colour gamut | 98% DCI-P3 |
| HDR | VESA DisplayHDR 400 |
| Adaptive sync | NVIDIA G-SYNC Compatible, AMD FreeSync Premium |
| Inputs | HDMI, DisplayPort |
| USB hub | 2 ports, USB 3.1 Gen 1 |
| Stand | Tilt, height and pivot adjustable |
The DisplayHDR 400 problem
This badge appears on a lot of monitors and means less than buyers assume. VESA’s DisplayHDR 400 tier requires 400 nits peak brightness and does not require local dimming.
Real HDR depends on being able to show a bright highlight next to a dark shadow in the same frame. That needs either very high peak brightness with zone-by-zone dimming, or a panel where individual pixels switch off entirely. An edge-lit IPS panel at 400 nits can do neither.
If genuine HDR matters to you, the honest answer is an OLED panel, where black pixels are actually off. Our LG UltraGear 27 OLED review covers that step up and what it costs.
The stand is the underrated part
Tilt, height and pivot, all included. That sounds unremarkable until you price monitor arms — a decent one costs a meaningful fraction of the monitor.
Height adjustment is the one that matters most for comfort. A screen that sits too low pulls your head forward and down for eight hours a day, and no amount of panel quality compensates for that. Pivot — rotating to portrait — is genuinely useful for reading code or long documents.
If you do want it on an arm anyway, check the weight against the arm’s range first. Our Ergotron LX review explains why the minimum weight catches people out more often than the maximum.
165 Hz, 180 Hz, and what you will notice
The 180 Hz figure is an overclock you enable in the on-screen menu; out of the box it runs at 165 Hz. The difference between the two is not something most people can see.
The difference between 60 Hz and 165 Hz is. For games it is the headline benefit. For work it shows up in scrolling and window dragging — a comfort improvement rather than a productivity one, but a real one, and hard to give up once you are used to it.
G-SYNC Compatible and FreeSync Premium both being supported means the monitor matches its refresh rate to your graphics card’s output regardless of which brand you run, which removes tearing without the input lag of traditional v-sync.
Strengths and compromises
What it does well
- 98% DCI-P3 from a Nano IPS panel — genuinely wide gamut
- Tilt, height and pivot all in the included stand
- 1440p at 27 inches, the density sweet spot
- Works with both NVIDIA and AMD adaptive sync
- 400 nits is bright enough for any normal room
- 1 ms GtG response for fast games
What to think about first
- DisplayHDR 400 is a label, not usable HDR
- IPS contrast means blacks look grey in a dark room
- No USB-C input — laptops need a separate cable for power
- USB hub is only two ports
- Wide gamut can oversaturate colours in some Windows apps
- Costs more than 1440p panels that are fine for work alone
How it compares with the cheaper option
The obvious rival at this size and resolution is the Gigabyte M27Q, which costs less and adds a KVM switch and a USB-C input the LG does not have.
| LG 27GP850-B | Gigabyte M27Q | |
|---|---|---|
| Brightness | 400 nits | 350 nits |
| Colour | 98% DCI-P3, Nano IPS | Wide gamut, 95% on rev 2.0 |
| USB-C input | No | Yes |
| KVM switch | No | Yes |
| Subpixel layout | Standard RGB | BGR on rev 1.0 |
| Stand adjustment | Tilt, height, pivot | Height adjustable |
The short version: the LG is the better panel and the safer purchase. The Gigabyte is better value and more flexible if you run two machines, provided you get revision 2.0.
Who should buy it
Good fit
- One screen for work and games
- You do colour-sensitive work
- You want a proper stand without buying an arm
- You want a panel with no revision lottery
Look elsewhere
- You want real HDR — buy OLED
- You need USB-C to drive and charge a laptop
- You run two machines and want a KVM
- Budget is the deciding factor
What we could not assess
We have not measured brightness, contrast, colour accuracy out of the box, or response times. All figures above are LG’s published specification. Panel uniformity and backlight bleed vary between individual units of any IPS monitor, which is an argument for buying somewhere with a straightforward returns policy.
Frequently asked questions
Is DisplayHDR 400 real HDR?
Not in any meaningful sense. The tier requires 400 nits and no local dimming, so the display cannot show bright highlights against dark shadows the way HDR content is graded for. Most owners leave HDR switched off.
What is Nano IPS?
LG’s name for an IPS panel with nanoparticles applied to the backlight to narrow the colour output, producing a wider gamut. Here it delivers 98% DCI-P3 coverage.
Can it charge my laptop?
No. It has HDMI and DisplayPort inputs but no USB-C, so a laptop needs a separate power connection. If one-cable operation matters, look at a monitor with USB-C or add a dock.
Do I need the 180 Hz overclock?
Not really. It runs at 165 Hz by default and the difference to 180 Hz is not something most people can perceive. The meaningful jump is from 60 Hz.
Why do colours look oversaturated?
Wide-gamut panels can oversaturate content that assumes sRGB, because Windows colour management is inconsistent across applications. Switching the monitor to its sRGB emulation mode usually fixes it.
LG 27GP850-B or Gigabyte M27Q?
The LG has the better panel, brighter output and no revision lottery. The Gigabyte costs less and adds a USB-C input and a KVM switch. Pick the LG for image quality, the Gigabyte for flexibility and value.
- Gigabyte M27Q — the cheaper rival with a KVM
- LG UltraGear 27 OLED — if you want real HDR
- Ergotron LX monitor arm
- BenQ ScreenBar Halo 2 — lighting that clamps on top
- CalDigit TS4 — one cable for the whole desk
Sources. Panel, brightness, colour gamut, refresh and stand specifications are LG’s own published figures for the 27GP850-B. VESA DisplayHDR tier requirements are VESA’s published standard. We have not tested this product ourselves and do not claim to have. Primary source: LG’s 27GP850-B specification page.
The opposite case: the AOC Q27G3XMN has 336 dimming zones and DisplayHDR 1000, so its HDR badge is worth switching on.
Want HDR that works? See LG 27GP850-B vs AOC Q27G3XMN.