Corsair Xeneon 34WQHD240-C QD-OLED review: Sleek and shiny with stellar performance and imagery

The Xeneon 34WQHD240-C is a 34-inch 21:9 curved OLED gaming monitor with 240 Hz, adaptive sync, and wide gamut color from quantum dots.

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Corsair Xeneon 34WQHD240-C
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(Image: © Tom's Hardware)

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To compare the 34WQHD240-C’s performance, I’ve included the newest 34-inch ultra-wide OLEDs from my database. 240 Hz is a relative newcomer to this category. Older models run at 165 and 175 Hz, and they are visibly less smooth. They are Samsung’s Odyssey OLED G8, Philips’ 34M2C8600 and Alienware’s AW3423DWF. 240 Hz monitors in this grouping include the review subject, plus Gigabyte’s MO34WQC2 and the Asus PG34WCDM.

Pixel Response and Input Lag

Click here to read up on our pixel response and input lag testing procedures.

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Corsair Xeneon 34WQHD240-C
(Image credit: Tom's Hardware)

The three 240 Hz screens take the same 4ms to draw a full white field. Observing moving test patterns from BlurBusters shows no difference in video processing. They all deliver perfect motion resolution. That means moving elements have the same clarity as static ones.

The 34WQHD240-C ekes out a victory in the total lag test with a very quick 20ms score. Currently, it is the fastest 240 Hz ultra-wide gaming monitor you can buy. While my skills are not enough to tell a 3ms difference, pro gamers might gain an advantage from the Corsair. The lower refresh rate monitors aren’t far behind, but they will show a slight bit of motion blur during the fastest movements.

Test Takeaway: 240 Hz OLED monitors like the 34WQHD240-C are the current performance pinnacle. No other class of display can match their complete lack of motion blur. And only a few 360 and 500 Hz screens boast lower input lag. Even a 360 Hz OLED won’t be more than a millisecond or two faster. It truly can’t get much better than this.

Viewing Angles

Corsair Xeneon 34WQHD240-C

(Image credit: Tom's Hardware)

The 34WQHD240-C’s off-axis image quality is superb. Though any OLED will shine in this test, this one is just a smidge better than average. There are no visible differences between the head-on and 45-degree views. Light output, gamma and grayscale all remain consistent. Even the top view shows almost no change. It is a bit lighter in gamma but otherwise the same. This is excellent performance.

Screen Uniformity

To learn how we measure screen uniformity, click here.

Corsair Xeneon 34WQHD240-C

(Image credit: Tom's Hardware)

Nearly all the OLEDs I’ve reviewed show premium quality screen uniformity. This is as it should be for a high-end category like this. The 34WQHD240-C is consistent with its 6.13% score. There are no visible issues in the 10% field I measured, nor are there flaws in any other patterns. Color fields are completely uniform as well.

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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.

6 Comments Comment from the forums
  • strobolt
    Is there power delivery included in the USB-C video port and how many watts?
    Reply
  • das_stig
    So once again TH takes no notice of forum comments from previous monitor reviews, just be ignorant !

    Cons-
    No internal speakers or LED lighting
    Incorrect, to me and probably a large percentage of buyers, this is a Pro, stop being bias !
    Reply
  • Dieter Binst
    Regarding the comparison of input lag, on which firmware we're the screens tested? I don't know for all screens, but input lag on the Alienware, has been reduced with firmware upgrades.
    Reply
  • thestryker
    The pixel layout on the earlier panel caused some text issues (it either bothered you or not) so it would be good to note if it's the same (it was on MSI's 240hz so I assume it is here too).

    Still not sold on going OLED longevity wise, but there are no good alternatives in the ultrawide space so I may end up there just the same.
    Reply
  • Jame5
    strobolt said:
    Is there power delivery included in the USB-C video port and how many watts?
    This honestly is one of the main things I'm looking for in a new monitor. I have an older 34" Alienware model, and I'm just waiting for one of the new QD-OLED models (Alienware or otherwise) to be the "One monitor to rule them all." My office is where my gaming setup is, but it's also where I do work. I would love to have a USB-C + PD connection for my work laptop when it's in use, and a DP 2.0/HDMI 2.1 connection for my desktop when it's time to relax.

    Part of me wonders if the 100w power supply would push the heat limits inside the chassis to the point where they would require active cooling on the monitor?
    Reply
  • 8086
    I wish this monitor had Gsync Ultimate but not instead of Freesync Premium Pro. I would love to see more monitors that are certified for both.
    Reply