Monitor MPRT Explained: What That 1ms Number Means

MPRT stands for Moving Picture Response Time. It measures how long a single frame stays visible on your screen, in milliseconds, and that is what decides how blurry things look when you follow them with your eyes. Lower is better. The surprise is that MPRT has little to do with how fast your pixels change colour. It is set by how long each frame is held in front of you, which puts your frame rate in charge of it.

MPRT vs GtG: what each number measures

Gaming monitors list two response time numbers, and they describe different things.

GtG (grey to grey) is how long a pixel takes to shift from one shade to another. MPRT is how long that pixel then stays lit before the next frame arrives. A pixel can finish its colour change in a fraction of a millisecond and then sit there, unchanged, for the rest of the frame. Your eyes keep moving while it sits still, and that smear across your retina is the blur you see.

The two response time numbers on a gaming monitor spec sheet

	GtG	MPRT
What it measures	How fast a pixel changes shade	How long a pixel stays visible
What you notice	Ghosting, trails, bright halos	Overall blur when you track motion
Set mainly by	Panel type and overdrive	Frame rate, refresh rate, strobing
Typical figures	0.03ms to 5ms	1ms to 16.7ms

GtG (grey to grey) is how long a pixel takes to shift from one shade to another. MPRT is how long that pixel then stays lit before the next frame arrives. A pixel can finish its colour change in a fraction of a millisecond and then sit there, unchanged, for the rest of the frame. Your eyes keep moving while it sits still, and that smear across your retina is the blur you see.

This is why a screen with almost instant pixels can still look soft in motion. OLED is the clearest case. Its pixels switch in roughly 0.03ms, but on a 60Hz OLED every frame still hangs on screen for 16.7ms, so fast motion still smears. The GtG versus MPRT page at Blur Busters has a moving bar animation that separates the two effects on your own display.

Why your frame rate sets the MPRT floor

Most displays work by sample and hold. Each frame appears, then stays put until the next one replaces it. So the shortest MPRT you can get is the length of one frame. Divide 1000 by your frames per second and you have the floor.

One millisecond of persistence works out to one pixel of blur for every 1000 pixels per second of motion. Swing your view across a shooter at 2000 pixels per second on a 240fps screen and objects smear across about eight pixels. The same swing at 60fps smears across 33.

Frame rate sets the lowest MPRT a sample and hold display can reach

Frames per second	Shortest possible MPRT	Blur at 1000 pixels per second
60	16.7ms	About 17 pixels
120	8.3ms	About 8 pixels
144	6.9ms	About 7 pixels
240	4.2ms	About 4 pixels
360	2.8ms	About 3 pixels
480	2.1ms	About 2 pixels
1000	1.0ms	About 1 pixel

Read that first column as frames per second, not as the number on the box. A 240Hz monitor showing a game at 60fps blurs exactly like a 60Hz one, because each frame is still visible for 16.7ms. Refresh rate only pays off when your graphics card can fill it.

Where a 1ms MPRT rating comes from

There are only two ways to hold a frame for a single millisecond. One is to run 1000 frames per second on a 1000Hz display. The other is to show the frame for 1ms and keep the screen dark for the rest of the refresh cycle. Almost every 1ms MPRT rating you can buy today is the second one.

That method is backlight strobing, and it goes by many names: ULMB, ULMB 2, ELMB, DyAc, MBR, black frame insertion, or simply MPRT in the monitor menu. The backlight flashes once per frame instead of staying on, so each frame is visible for a short pulse rather than a whole cycle, and blur falls in proportion. NVIDIA’s ULMB 2 flashes for roughly a quarter of each cycle, which gives a 360Hz panel about the motion clarity of a 1440Hz one.

Those four letters do two jobs. MPRT is a measurement that applies to every display, including ones with no strobing at all, and on some monitors it is also the name of the strobe toggle in the menu. MSI’s version has levels from 0 to 20.

Should you turn the MPRT setting on?

Switch it on, play something you know well, and then weigh three costs.

• Brightness. The screen sits dark for most of each frame, so peak brightness drops. Older strobe modes often fell to somewhere near 100 to 150 nits. Newer ones hold up better, and the G-Sync Pulsar monitors that reached shops in January 2026 keep around 300 nits with strobing running.
• Flicker. Strobing is flicker, on purpose. Most people never see it at high refresh rates, but if you get eye strain or headaches after a long session, this is a likely cause.
• Variable refresh rate. On most monitors, strobing and FreeSync or G-Sync cannot run at once, because strobing wants a fixed refresh rate and VRR keeps changing it. A few features get past that, including MSI MPRT-Sync, Gigabyte Aim Stabilizer Sync, ASUS ELMB-Sync, and NVIDIA G-Sync Pulsar, which pairs a rolling backlight pulse with VRR on four 1440p 360Hz screens from Acer, AOC, ASUS and MSI.
• Variable refresh rate. On most monitors, strobing and FreeSync or G-Sync cannot run at once, because strobing wants a fixed refresh rate and VRR keeps changing it. A few features get past that, including MSI MPRT-Sync, Gigabyte Aim Stabilizer Sync, ASUS ELMB-Sync, and NVIDIA G-Sync Pulsar, which pairs a rolling backlight pulse with VRR on four 1440p 360Hz screens from Acer, AOC, ASUS and MSI.

Strobing earns its keep in competitive shooters, where you hold a steady high frame rate and want the sharpest possible target tracking. It earns much less in slower single player games, in HDR, and on the desktop. If the setting is greyed out, check whether HDR or a dynamic contrast mode is switched on, because those usually block it.

What counts as a good MPRT number

Start from the frame rate you actually hold. Under about 5ms means 240fps or better, and that is where blur stops being the first flaw you notice. Around 8ms, or 120fps, is comfortable for most games. At 16.7ms, or 60fps, blur is the biggest thing standing between you and a clear picture.

Compare like with like. A strobed 1ms figure and a non-strobed 4ms figure often describe the same monitor in two modes, and the strobed one only counts while you accept a dimmer image and no VRR.

For a comparison that does not rest on a single number, look for VESA’s ClearMR badge. It grades motion clarity in tiers from 3000 up to 21000 with a high speed camera, and strobing is switched off during testing, so the tier reflects what the panel does on its own.

For a comparison that does not rest on a single number, look for VESA’s ClearMR badge. It grades motion clarity in tiers from 3000 up to 21000 with a high speed camera, and strobing is switched off during testing, so the tier reflects what the panel does on its own.

The floor keeps dropping. 480Hz and 720Hz OLED panels are already on sale, and Samsung showed a 1,040Hz monitor at CES 2026. Feed a display like that 1000 frames per second and you get 1ms MPRT with no strobing, no flicker and no loss of brightness.

Conclusion

MPRT tells you how long each frame lingers, and that is what your eyes read as motion blur. Treat it as a frame rate figure rather than a panel figure: the higher the frame rate you actually hold, the lower it goes. Use a strobing mode if you want a shortcut to sharper motion in fast games, and go in knowing you are trading brightness and variable refresh rate for it.

For more, see our monitor specs guides.