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PG27AQN with ULMB2 - what type of V-Sync should I be using to eliminate tearing?

Posted: 26 Dec 2025, 03:05
by DFL91
With a 4090 my frames are stable and I'm running the monitor at 240hz because I don't want to use DSC. But with ULMB2 you obviously can't use G-Sync at the same time. So, with Reflex on Ultra, do you just use regular V-Sync, adaptive V-Sync, or Fast V-Sync? Or maybe Scanline Sync with Rivatuner?

Just wondering which of these options would be best for lower input lag while also eliminating screen tearing.

Re: PG27AQN with ULMB2 - what type of V-Sync should I be using to eliminate tearing?

Posted: 09 Jan 2026, 02:45
by nuninho1980
Regular vsync is best but ULMB2 should be enabled. If you want to enable G-Sync, you should enable Pulsar (but need newest firmware for your monitor). :)
You should use Reflex. Or you enable triple buffer (TB) for vsync required but TB may degrade or damage VRAM despite non-overclock speeds, if GPU usage isn't lower than 75%.

Re: PG27AQN with ULMB2 - what type of V-Sync should I be using to eliminate tearing?

Posted: 13 Jan 2026, 14:14
by twisterr
i wonder the price difference, if they had used a QD backlight instead of red phosphor backlight