1ms GtG vs 1ms MPRT: What Monitor Specs Mean

Two gaming monitors can both promise “1ms response time” while talking about different measurements. The letters beside the number—GtG or MPRT—matter. GtG describes how long a pixel takes to shift between shades; MPRT is a separate time-based motion-blur metric. A 1ms MPRT figure does not mean every pixel transition takes 1ms, and neither number describes the full delay from a button press to the image you see.

Find the method and operating mode before comparing the spec. This guide uses manufacturer and VESA documentation available by 11 October 2026. It is a documentation-based explainer, not a benchmark of the monitors cited below.

GtG: how quickly a pixel changes

Grey-to-grey (GtG) measures the time a pixel takes to change from one grey level to another. MSI describes response time as how quickly a pixel reacts to an incoming signal and lists GtG and MPRT as separate approaches in its monitor response-time notes . That makes GtG a pixel-transition figure, not a stopwatch for the complete path from a mouse or controller input through the game, graphics card and display.

A single number also leaves open which transition and setting produced it. Look for qualifiers such as “minimum”, “with overdrive” or a named response-time mode in the exact monitor's specification and manual. As a practical inference from the metric, a headline GtG figure alone cannot tell you how every shade transition will look at every refresh rate.

Overdrive is intended to make pixel transitions faster, but the fastest setting is not automatically the cleanest. MSI's 2022 guide for its PRO MP241CA and MP271CA monitors warns that overshoot may occur at the Fastest overdrive level. VESA also limits overshoot and undershoot in its ClearMR tests because tuning only for a lower time can introduce visible artifacts. Those are model and test-specific details, but they are a good reason to inspect the full mode instead of choosing by the smallest millisecond value.

MPRT is a different motion-blur number

Motion Picture Response Time (MPRT) is a separate, time-based way to describe motion blur. It is not another name for the time a pixel takes to change between grey shades. VESA says a time-only blur metric cannot capture all effects of image enhancement, including overshoot and undershoot; its ClearMR overview explains why it created a different motion-clarity test.

A manufacturer's own specification shows why the suffix matters. MSI's 2023 Optix user guide gives these response-time figures for two models:

This table copies the vendor's specifications; it is not a head-to-head performance test. The models differ in other specifications, including resolution and refresh rate. It demonstrates a narrower point: the same 1ms MPRT figure can sit beside different GtG figures, so the bare number does not identify the measurement.

The mode matters too. In the same MSI Optix user guide, revision 1.1 (July 2023) notes that enabling MPRT Sync on those models greys out brightness and response-time controls; the mode is available only above 85Hz. That is specific to these monitors, not a rule for every brand. Check your exact model's manual for what an MPRT or blur-reduction mode changes.

Where VESA ClearMR fits

ClearMR, short for Clear Motion Ratio, is VESA's certified motion-clarity program. It is a different scale from milliseconds: VESA bases the result on the ratio of clear pixels to blurry pixels in a moving-pattern test. The ClearMR test description says a high-speed camera records the moving pattern, while testing uses the display's native resolution and maximum frame rate, with backlight strobing disabled and limits on overshoot and undershoot.

That gives the certification a defined basis for comparing ClearMR-certified displays. It does not make a tier interchangeable with a GtG or MPRT number. There is also a practical limit: because the VESA test disables backlight strobing, its result does not directly describe how the same screen looks with a strobing mode enabled. That conclusion follows from the published test conditions.

VESA's December 2024 update added ClearMR 15000, 18000 and 21000 tiers for newer high-refresh displays. Those labels are performance tiers, not response times in milliseconds. Compare ClearMR with ClearMR, and keep the method separate from GtG and MPRT.

How to compare a monitor's 1ms claim

• Read the suffix. Check whether the product page says GtG, MPRT or another named metric. If it only says “1ms”, look for the exact model's detailed specification or manual before comparing it with another display.
• Find the operating condition. Note the resolution, refresh rate, overdrive level and any MPRT or blur-reduction mode tied to the claim. Check whether the mode changes brightness or disables another control.
• Compare like with like. Compare GtG figures with GtG figures under similar conditions, MPRT with MPRT when the method and conditions are comparable, and ClearMR tiers only with other certified ClearMR results. Do not convert one scale into another.
• Check motion and latency separately. If a detailed review is available, look for transition measurements at the refresh rate you plan to use and a separate input-latency result. In your own game, compare the same moving scene and watch for trailing or bright/dark overshoot; a static screenshot cannot show how motion looks.

A “1ms” badge is incomplete without its method. GtG describes a pixel-transition claim, MPRT is its own time-based blur figure, and ClearMR is a certified motion-clarity tier. Read the suffix, check the operating mode and judge the image you will actually use.

Sources checked

• MSI, “Monitor Response Time” (15 January 2021)
• MSI, PRO MP241CA / MP271CA User Guide, revision 1.0 (September 2022)
• MSI, Optix MPG321UR-QD / MPG321QRF-QD User Guide, revision 1.1 (July 2023)
• VESA, “VESA Brings Clarity to Motion Blur in Digital Displays” (22 August 2022)
• VESA, “VESA Adds New Performance Levels to ClearMR” (30 December 2024)