Blur Busters Forums

Hello so I'd like to share my dilemma with DSC and mouse input feeling. I have recently purchased the 540hz pg248qp and a RTX 3070TI because my 1080ti has no DSC capability so it capped the monitor to 500hz & 4:2:2 chroma subsampling; the picture quality was also hella ugly and I wanted to get a new gpu to rectify it. Now I have both GPUS, I get into a game with the 3070ti installed and instantly I can feel my cursor feel very heavy and my input delayed. Then I suspected it could be the DSC, I swap my old 1080ti back to the system and everything seems fine again, I swap both gpus again for 6 times already and I can notice the same input lag on this rtx card. I've also tried tweaked nvidia profiles on both cards and it's still the same. My system is also fully capable of running 540hz with high end parts. I'd like to know if anybody else experiences this issue.

Does it still happen if you disable DSC in the monitor?

Ok the input lag is gone now, but it's capped to 360hz and I've made a custom resolution for 500hz and selected 8bit 4:2:2 chroma sampling and now it feels snappy, altho picture quality is ugly

Well, that probably means the monitor's DSC implementation is crap. Maybe they'll fix it in a firmware update, but realistically, I wouldn't hold my breath.

I have a PG248QP and I didn't experience input lag issues like this at 540Hz. Maybe you need to RMA the monitor if everything else in your setup is 100% not the problem. I.e., DP cable, Nvidia drivers, etc.

TFTCentral input lag test:

https://tftcentral.co.uk/reviews/asus-r ... g248qp#Lag

RTINGS input lag test:

https://www.rtings.com/monitor/reviews/ ... #test_1435

It's an unexplicable heavy mouse feeling that input lag tests can't measure afaik. Yeah I'll just return it and switch back to my old 390hz monitor. I'll wait for nvidia cards & monitors that can support dp 2.1 with no compression.

So i had the same experience with my PG27AQN & ROG STRIX 4080 OC. The way it was explained to me was,If youre playing FPS games and unable to reach fps close to your monitors refresh rate, then enabling G-Sync will actually give you less latency......it def made a huge diffrence for me.

I'm sorry to reup this, but I can basically confirm what OP says. I have the same GPU and display, 360hz DSC off feels snappier than 540hz DSC on. I'm currently playing at 360hz, it's capped. I can't understand how can I create custom resolution with 500hz. I'm playing mainly cs2 1024x768 or 1280x1024. Both doesn't work at 500hz when DSC disabled. When I try to create such custom res in NVCP screen just stays black. Any advice?

What's up with these random accounts making threads & commenting with no data?
DSC does not add any noteworthy input delay, despite how many people want to try and feel something.
What most here are "feeling" is better refresh rate compliance due to lower refresh rates, hence placeboing themselves that DSC is the culprit (heavily due to the thread of a similar title of a somewhat-known placebo-induced user). This is very noticable on the PG248QP, which is completely compliant at 360hz, but heavily missing the mark at 540hz.

It adds 500ns (0.5µs) of delay, as per this: https://www.tesmart.com/blogs/news/what ... ession-dsc

How Does DSC Work?
Display Stream Compression (DSC) is a mathematically lossy but visually lossless compression algorithm. This means that although there are some differences in the final image produced after compression, these differences are imperceptible to the human eye. DSC employs various encoding tools to achieve this and can deliver a 3:1 reduction in data size. It accomplishes this with only a 0.5-microsecond increase in overall latency, making it suitable for gaming without affecting the visual experience or gameplay.

Stop spreading FUD.
Not a single display with DSC has measurably high total input lag, as seen with many reviews.
Look somewhere else in the input lag chain.

kyube wrote: ↑

27 Feb 2025, 08:45

Stop spreading FUD.

Wow. I'm not trying to spread FUD against DSC. Tbh I don't care if it's "refresh rate compliance" or DSC or something else, I can't measure it with my eyes as you correctly said I'm commenting with no data. All I know is problem exists with DSC enabled. Could it be n_o_t DSC? Sure.
The only reason I posted here, cuz OP mentioned he could manage to create custom 500hz res:

ihatedscc wrote: ↑

13 Dec 2024, 08:17

it's capped to 360hz and I've made a custom resolution for 500hz

So I'm not blaming DSC, I'm trying to create working custom res without DSC to see if it was the problem.