Cooler Master Tempest GP2711 Gaming Monitor Review: High Brightness and High Performance

27-inch QHD VA Mini LED gaming monitor with 576 dimming zones, 165 Hz, Adaptive-Sync, HDR 1000 and wide gamut color.

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Cooler Master GP2711
Editor's Choice
(Image: © Tom's Hardware)

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The GP2711’s Mini LED backlight means bright and punchy HDR. It’s rated for 1,000 nits but goes well above that. 576 local dimming zones can deliver unmeasurably low black levels. HDR10 signals switch it over automatically, where you get three additional picture modes. I tested in the default User preset

Our HDR benchmarking uses Portrait Displays’ Calman software. To learn about our HDR testing, see our breakdown of how we test PC monitors.

HDR Brightness and Contrast

Image 1 of 3
Cooler Master Tempest GP2711
(Image credit: Tom's Hardware)

The GP2711 is extremely bright, like all the Mini LED monitors I’ve tested. To achieve 1,500 nits, I had to measure a 25% window pattern. A full white field measured 659 nits. With any setting of the local dimming, black levels were unmeasurable. When local dimming is turned off, some dynamic trickery still happens because I measured 5,954:1 contrast. I noted that local dimming was aggressive enough to clip detail and throw off luminance tracking to the detriment of image quality. Therefore, I recommend leaving it off for HDR content.

Grayscale, EOTF and Color

Image 1 of 4
Cooler Master Tempest GP2711
(Image credit: Portrait Displays Calman)

The first chart above shows what I mean. Local dimming negatively affects the EOTF with significant shadow and midrange detail clipping. You can see how far below the reference line the trace is. It also hits the tone-map transition too soon, meaning content in the 70-80% brightness range will be off the mark. Simply turning off the local dimming fixes these issues. There is still some processing because I measured almost 6,000:1 contrast, almost double the SDR ratio. But the resulting image is very bright and impactful. I noted that brightness could be adjusted, though it looked fine when set to 100%. Grayscale tracking is without visual error.

HDR color is generally over-saturated, like most wide gamut monitors I’ve reviewed. The GP2711’s tracking is linear and consistent, so you won’t see loss of detail in any part of the image. Gamut coverage is nearly 100%, which means you’ll see almost all the green in extended color content. That’s a good thing. The same thing happens when using Rec.2020 as a reference, except the GP2711 runs out of color between 80 and 90%. That’s typical performance as well.

Test Takeaway: I haven’t met a Mini LED monitor I didn’t like for HDR content. The GP2711 exemplifies the technology with a super bright and saturated HDR presentation. My only complaint is the local dimming, which is too aggressive in operation. Even the lowest setting clips detail and misses the luminance tracking reference. Fortunately, the picture looks great with it turned off.

MORE: Best Gaming Monitors

MORE: How We Test PC Monitors

MORE: How to Buy a PC Monitor

Christian Eberle
Christian Eberle
Contributing Editor

Christian Eberle is a Contributing Editor for Tom's Hardware US. He's a veteran reviewer of A/V equipment, specializing in monitors. Christian began his obsession with tech when he built his first PC in 1991, a 286 running DOS 3.0 at a blazing 12MHz. In 2006, he undertook training from the Imaging Science Foundation in video calibration and testing and thus started a passion for precise imaging that persists to this day. He is also a professional musician with a degree from the New England Conservatory as a classical bassoonist which he used to good effect as a performer with the West Point Army Band from 1987 to 2013. He enjoys watching movies and listening to high-end audio in his custom-built home theater and can be seen riding trails near his home on a race-ready ICE VTX recumbent trike. Christian enjoys the endless summer in Florida where he lives with his wife and Chihuahua and plays with orchestras around the state.

11 Comments Comment from the forums
  • cknobman
    Forgive my ignorance but if local dimming ruins the picture what is the point, or advantage, of having the mini led's and over 500 dimming zones? (besides a brighter picture)
    Reply
  • UnforcedERROR
    cknobman said:
    Forgive my ignorance but if local dimming ruins the picture what is the point, or advantage, of having the mini led's and over 500 dimming zones? (besides a brighter picture)
    Fascinating question, because otherwise you're dealing with a completely standard LCD experience. The entire point of dimming zones is to give better contrast, especially when it comes to black levels. I read another review contrary to this, which also noted the brightness being diminished, that claimed local dimming was helpful with image quality.

    I find it strange to say not to use local dimming in a mini-LED monitor, personally.
    Reply
  • crimsonfilms
    I have the
    cknobman said:
    Forgive my ignorance but if local dimming ruins the picture what is the point, or advantage, of having the mini led's and over 500 dimming zones? (besides a brighter picture)
    I have the GP27U, the 4K version of this monitor. I love it. The dimming on that is excellent. As good as you gonna get for zone dimming panels. Mini LEDs still generally provide better brightness and to some extent color control than classic edge lit LEDs.
    Reply
  • wingfinger
    I have sort of eliminated VA panels from my consideration. I have heard that there is a common issue with black smearing, caused by black parts of the image transitioning slower than the brighter parts.

    Most of the time I would value an artifact free image that is self-consistent. (I have heard that a few have ok-good transitions times, though)

    For that reason, I also consider HDR, a nice to have because unless you have the budget for an OLED, there are times when you will want to turn it off. Right?

    Games these days do seem to show no hesitation in having dark areas, though.

    A lot of monitors are starting to sport a wide gamut. I would like to, also, use the monitor for some image editing or maybe content creation, but that would be SRGB or maybe Adobe. Right?
    ...
    To be viable, the monitor has to support modes that correctly project the user input to the panels value set. Some don't have options, and some might not be accurate. Furthermore, the scaling would be crunching the numbers down -- more so the wider the native gamut. This for example, says a native 8 bit panel. A 10 bit panel could be better in this regard but might cost a bit more.
    Reply
  • UnforcedERROR
    wingfinger said:
    I have sort of eliminated VA panels from my consideration. I have heard that there is a common issue with black smearing, caused by black parts of the image transitioning slower than the brighter parts.

    Most of the time I would value an artifact free image that is self-consistent. (I have heard that a few have ok-good transitions times, though)

    For that reason, I also consider HDR, a nice to have because unless you have the budget for an OLED, there are times when you will want to turn it off. Right?

    Games these days do seem to show no hesitation in having dark areas, though.

    A lot of monitors are starting to sport a wide gamut. I would like to, also, use the monitor for some image editing or maybe content creation, but that would be SRGB or maybe Adobe. Right?
    ...
    To be viable, the monitor has to support modes that correctly project the user input to the panels value set. Some don't have options, and some might not be accurate. Furthermore, the scaling would be crunching the numbers down -- more so the wider the native gamut. This for example, says a native 8 bit panel. A 10 bit panel could be better in this regard but might cost a bit more.
    The other version of this monitor is an IPS, and probably tracks closer to your expectation.

    That said, it's rare to find a true 10-bit panel in this price range. Most things listed as 10-bit are really 8-bit + FRC. The difference is negligible, but some people are picky about that.
    Reply
  • -Fran-
    The CM miniLEDs are like the dark horse of the race. They are super good.

    I got one of them last Xmas because they were super cheap and the specs were super good. After receiving the first one, I bought 3 more, but unfortunately they only had 2 left, so I was only able to get 3 in total.

    In any case, it's a really good monitor for the price. More so if you can find it with a nice discount.

    Regards.
    Reply
  • wingfinger
    When I was looking at rtings a while back, I saw AOC Q27G3XMN had some similar qualities.

    But I felt it was a risk. It shows up as a notable mention for best gaming monitors list despite overall good scores.
    Reply
  • 35below0
    "The GP2711’s VA panel already provides a lot of dynamic range. It doesn’t need much help to be excellent."

    I guess the dimming doesn't add so much to this monitor, but that is hardly dissapointing.
    Might be a useful setting to tweak. For someone.
    Reply
  • digitalgriffin
    There's a lack of understanding here by many.

    FIrst off, cooler master doesn't make their own panels. They pick one from a few mfgs like AU Optronix, Samsung, or LG. There's a few other players but they are the big ones.

    Local dimming zones not only increase contrast but can also help with color accuracy. Let me explain.

    Every LCD panel has back light bleed. That's the small percentage of light that shoots through even when the LCD cell is full closed. So let's take some really exaggerated numbers. For example let's say we have a 10% leak through. Let's say you wanted 50% red. Are you looking at 54% red, 10% Blue 10% green. That's because of wash through and black level minimums and calibration. You aren't looking at a true red but a semi washed out version.

    To understand this look at the stars from a city. Most are washed out against a backlit sky from city lights. Now go to the country and look. Way different view..

    So let's say we want to improve this. We turn down the backlight by half. You open red fully at 100% instead of 50% because we have 1/2 light. But the back light bleed through is half. This is where the improvement comes from.

    The other issue is led light purity. Ideally to get a full color gamut you not only require low black levels, but also pure light colors. Red, Green, and Blue LEDs aren't truly mono chromatic like a laser. They give off a color distribution around their pure color. But again this creates color impurities. The only way to fix this is color filters. This is where tech like quantum dots come in. They really narrow the spectrum of light output. But quantum dots (QD) have longevity issues as they are typically organic, suffer burn in, and lamination issues. The failure rate of early QDs is huge.

    Those 10 bit panels are a bit misleading also. There very few fast high quality true 10 bit panels and they cost a fortune. What most cheap 10 bit panels take an 8 bit panels and then alternate how often the panel blips open. I'm going to simplify some math here and say our panel is only capable of 200 distinct levels (8 bit is 256 but...math is complicated) Let's say you want 25.1% red. What you would get is a 50 one frame, 50 another frame, 50 a third frame, and then 51 the fourth. What's 201/(200 * 4 frames). ? That's right 25,1. However you werent looking at 25.1% every frame. Your eyes averaged it out. It's a cheap trick that has limitations. And this is a very common trick for really fast cheap TN panels, which use even worse 6 bit panels!

    Finally the last issue is your environment. Unless you play in a dark dark room you won't benefit from most of this tech because your own screen reflects light impurities back into your eye. You ever look through a car window and see your own face reflected back? Your room is full of light polluting sources reflected by that screen.

    And ignore that article about ratings.com about oleds being superior. Burn in on regular LED LCD is near impossible and easily reversible. What you do get is burn in of QD elements. Or you get liquid crystal memory. The later is fixable by quickly switching from closed to open for an hour or so.

    For content masters you need to look at your target output. If it's film/TV, rec 2020. For all other consider DCI P3 or at the very least 100% sRGB coverage.
    Reply
  • razor512
    cknobman said:
    Forgive my ignorance but if local dimming ruins the picture what is the point, or advantage, of having the mini led's and over 500 dimming zones? (besides a brighter picture)
    There is one benefit to having a display like that and just setting it to a single static uniform backlight, while the luminance range gets decreased for HDR content (would effectively become HDR600 ), if the wider color gamut is maintained, then with good calibration, HDR gaming displays can work decently for video and photo work.
    Reply