Summary of "New ULMB 2 vs 500Hz – Fastest Gaming Monitor?"

What ULMB2 is and how it works

ULMB2 is NVIDIA’s updated ultra-low motion blur (backlight strobing) technology designed to reduce the motion blur caused by “sample-and-hold” displays (where each frame is held until the next). Backlight strobing briefly turns the display off between frames so perceived motion appears sharper; at high refresh rates (240 Hz and above) most people do not notice strobe flicker.

NVIDIA claims ULMB2 can match the perceived motion clarity of a 1000 Hz+ display. The technology also aims for precise tuning, minimal artifacting (for example, strobe crosstalk), and no problematic brightness loss.

NVIDIA claim: ULMB2 can match the perceived motion clarity of a 1000 Hz+ display, while minimizing artifacts and brightness loss.

Hardware compared

ASUS PG27AQN — 1440p, 360 Hz IPS. Received NVIDIA ULMB2 as an update and was tested as the main ULMB2 example. Brightness with ULMB2 on: up to ~275 nits and adjustable.
BenQ/ZOWIE XL2566K — 1080p, 360 Hz TN with Diac+ backlight strobe. Previously the reviewer’s “sharpest” experience.
240 Hz OLED panels — near-zero pixel response times and excellent contrast; noted for deep image and strong contrast benefits.
Alienware 500 Hz monitor — highest refresh rate tested; intended to deliver very short sample intervals (2 ms/frame at 500 Hz).

Tests and methodology

Used in-game motion tests generated with NVIDIA’s display testing software (a substitute for the UFO ghosting test from testufo.com / Blur Busters).
Realistic moving-target tests included examples like Lucio wall-running in Overwatch 2.
Performed moving-camera and in-game target/tracer comparisons to evaluate perceived blur and target clarity during fast motion.
Measured pixel response times on the 500 Hz monitor (average ~2 ms, with some transitions 3–4 ms).

Findings and analysis

ULMB2 on the PG27AQN produced significantly sharper motion, approaching a “perfect” (no-blur) target in the reviewer’s moving tests. Detail on moving objects (for example, weapon/tracer edges) was markedly improved.
ULMB2 avoided strobe crosstalk/double-image artifacts that can occur with other strobes, producing a very clean result on the 1440p IPS panel.
1440p resolution provides a tangible motion-clarity advantage versus 1080p — more detail on moving targets — so ULMB2 at 1440p stood out against Diac+ on the 1080p XL2566K. Diac+ still looked extremely crisp and remains competitive.
240 Hz OLED and 360 Hz ULMB2 IPS felt comparable for many play sessions. OLED benefits from contrast and black levels, while ULMB2/360 Hz helps in fast chaotic moments. After extended playing, the reviewer reported similar gameplay performance across both.
The 500 Hz monitor underwhelmed: although the frame interval is 2 ms, the panel’s pixel response times were not consistently fast enough (some transitions 3–4 ms), causing ghosting. In practice it did not deliver the expected “500 Hz feel” and had the slowest pixel response among the tested displays.

Conclusions and recommendations

ULMB2 is a major, effective backlight-strobing upgrade—particularly compelling at 1440p—and can approximate the perceived clarity of much higher refresh rates.
ULMB2 vs Diac+: ULMB2 on the 1440p PG27AQN looked cleaner with fewer strobed artifacts; Diac+ remains a very good option on 1080p TN panels.
High refresh rates alone are not a guarantee of better perceived clarity: 500 Hz panels must also have matching pixel response times. If response times lag, higher Hz alone will not improve perceived clarity.
The reviewer plans to list current monitor recommendations (across various price points) in the video description.

Testing tools, examples, and notes

Tests referenced: Flowbosses/testufo-style motion tests (UFO ghosting), NVIDIA’s display testing software that generates in-game motion images, moving-camera test, and in-game examples (Tracer guns, Lucio wall-run).
Games used for frame-rate-capable tests: Overwatch 2, Valorant.