To measure and calibrate monitors, we use an i1Pro spectrophotometer, a SpectraCal C6 colorimeter, and version 5.2.0.1374 of SpectraCal’s CalMAN software.
The i1Pro is very accurate and consistent measuring color on all types of displays, regardless of the backlight technology used. When we just need a luminance value, the C6 works better, especially in low light.
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For patterns, we employ AccuPel DVG-5000 and DVDO AVLab TPG video signal generators. This approach removes video cards and drivers from the signal chain, allowing the display to receive true reference patterns. Connections are made via HDMI.

The AccuPel DVG-5000 is capable of generating all types of video signals at any resolution and refresh rate up to 1920x1080 at 60 Hz. It can also display motion patterns to evaluate a monitor's video processing capabilities, with 3D patterns available in every format. This allows us to measure color and grayscale performance, crosstalk, and ghosting in 3D content via the 3D glasses.
The DVDO generator is a new addition to our lab. It supports resolutions up to 4096x2160. We’re using it to verify the proper signal handling of QHD and UHD displays.
The i1Pro or C6 is placed at the center of the screen (unless we’re measuring uniformity) and sealed against it to block out any ambient light. The AccuPel pattern generator (bottom-left) is controlled via USB by CalMAN, which is running on the Dell XPS laptop on the right.
Our version of CalMAN Ultimate allows me to design all of the screens and workflows to best suit the purpose at hand. To that end, I’ve created a display review workflow from scratch. This way, we can be sure and collect all the necessary data with a concise and efficient set of measurements.

The charts show us the RGB levels, gamma response, and Delta E error for every brightness point from zero to 100 percent. In the table, we get raw data for each measurement. And the area in the upper-left tells us luminance, average gamma, Delta E, and contrast ratio. The individual charts can be copied to the Windows clipboard to easily create graphics for our reviews.

Every primary and secondary color is measured at 20-, 40-, 60-, 80-, and 100-percent saturation. The color saturation level is simply the distance from the white point on the CIE chart. You can see the targets moving out from white in a straight line. The further a point is from center, the greater the saturation until you hit 100 percent at the edge of the gamut triangle. This shows us the display’s response at a cross-section of color points. Many monitors score well when only the 100-percent saturations are measured. Hitting the targets at the lower saturations is more difficult, and factors into our average Delta E value (which explains why our Delta E values are sometimes higher than those reported by other publications).
- Overlord Tempest X270OC: 27” 120 Hz IPS Gaming Monitor Review
- Packaging, Physical Layout, and Accessories
- Setup and Calibration Of The Overlord Tempest X270OC
- Measurement and Calibration Methodology: How We Test
- Results: Brightness and Contrast
- Results: Grayscale Tracking and Gamma Response
- Results: Color Gamut and Performance
- Results: Viewing Angles and Uniformity
- Results: Pixel Response And Input Lag
- Overlord’s Tempest X270OC Satisfies The Speed And Resolution Obsession

any idea if there will be a similar monitor spec but 4k resolution ?
thanks,
any idea if there will be a similar monitor spec but 4k resolution ?
thanks,
Question is how much will this cost here in Europe.
Also, now make the same thing happen in a 30" format with 2560x1600 resolution, and than I am definitely opening my wallet.
MonsterCookie, alas I doubt that will happen. A few years ago, 1440 and 1600
height monitors were priced basically the same, ie. expensive. Back then, top-end
GPU reviews tended to use 2560x1600 as a typical max res test for gaming. But
then buying patterns evolved, the usual feedback between pricing and demand,
people tended to opt more and more for 1440 displays instead. As a result, when
I wanted to get a 1600 IPS a while ago, I was amazed to find 1600 hieght displays
were about 4X more expensive than 1440 IPS models.
Presumably it suits the industry to home in on a more typical standard, and for
the moment, beyond HD, 2560x1440 seems to be it. Very unlikely the industry has
any interest in pushing 1600 height to the masses, so probably the next main step
up will be to 4K, or as I wish they'd call it instead, quad-HD.
Ian.
http://overlordcomputer.com/blogs/news/7384176-the-overclock-overview
It's like hoping you'll get an i7 that will have a stable OC to 4.5Ghz 24/7. It's the luck of the draw.
I don't much like putting my money on hope. If they did have a guarantee or just sold a monitor that shipped to my house with 120Hz capability, I'd be more likely to hand over my cash.
You know darn well they make sure the review site is getting a good one.
1) Yes, This works perfectly at 90Hz. Yes, it is a great improvement. Much greater improvement is 60->90 than 90->120.
2) All monitors are from this day to the future to come 16:9. So, its useless to fancy 16:10 monitors anymore, they wont be coming ever again.
3) 4K 120Hz gaming monitors wont be coming, either. At least not in the foreseeable future.
4) Overclocking this is not luck of the draw. They all come at least 96Hz, and the great majority work 120Hz.
5) The lack of displayport etc is what helps keeping input lag low.