miciorjz

Mar 27, 2025 08:53 AM By crabnebula

5

Thanks for the explanation. I assume this relates to the slight blurriness around contrasted text that some people see at 240 Hz, but not to the faint diagonal lines that others are experiencing even on uniform backgrounds. Correct?

Hopefully aappleby will respond!

I have the diagonal lines as you mention at all refresh rates, and the blurry image at 240hz. If there is an issue with voltage generally that causes the blurry image at 240hz (the ADC chips), then perhaps this also means a panel is susceptible to the diagonal lines? I’ve read that the diagonal lines are related to voltage drop across the panel…I’m a complete layman in terms of monitor hardware so this could be completely wrong.

If this theory is true though, perhaps it explains why RTings haven’t seen the diagonal lines, nor the blurry image at 240hz, themselves - they’ve got a panel that has “good” voltage? If true, it sucks that Samsung doesn’t seem to acknowledge any issues, despite this potentially being a problem with QC at the factory.

@Rtings Thank you for retesting this with a 5080. It’s really interesting to see that you have no issues whatsoever. Strangely, this seems to go against what many have experienced on Reddit.

Can you please confirm a few things around the test conditions?

• Was text clarity and gamma retested with the monitor running at 240hz?
• Was the monitor set to 10-bit in Windows?
• Was Adaptive-Sync switched on in the monitor settings, and G-Sync compatible mode switched on in Nvidia Control panel?
• HDMI or DP used?
• If you look in GPU-Z, what is the reported link rate (current) and (max)?

I appreciate you have limited time to test, let alone respond to comments, but it would be great if you could confirm the details above, as that would help myself and others troubleshoot this issue.

Thanks again!

@Rtings, I’ve made a post on Reddit going into a bit more detail on the issues I’m seeing at 240Hz with a 5080 FE card. There’s some speculation it could be related to Windows DWM in 24H2.

It would be really useful if you could retest the monitor - at least the sharpness and gamma/colour - using an Nvidia 50 series card. I’m sure you’d spot any differences immediately.

https://www.reddit.com/r/ultrawidemasterrace/comments/1iqd5qb/reduced_image_quality_on_samsung_57_g95nc_odyssey/

Feb 14, 2025 10:08 PM By billburnes111

6

I have the monitor but I haven’t been able to buy a 5090 yet, I’m using a 7900xtx

Can you try going to Nvidia’s homepage? It has the same effect as the app. At 120hz or below, the dropdown menu text (next to “GeForce”) are crystal clear, but at 240hz they look slightly distorted.

https://www.nvidia.com/en-gb/geforce/

Feb 13, 2025 09:07 PM By billburnes111

6

Are you using a good cable?

I’m using a DP80 certified cable, so I hope so!

I think you’re on to something with the Reddit link. I had to use that fix with the previous NVIDIA drivers to get custom resolutions, but I have since switched to DisplayPort and haven’t tried it since. I’ll give it a go.

If you’ve got this monitor, would you mind checking the NVIDIA App homepage at 240hz? The text under “GeForce RTX 5090” is quite distorted at 240hz, but at 120/60 it’s crystal clear. For me, this is one of the easiest ways to see the fuzziness.

Has this monitor been tested with a 50-series NVIDIA GPU? Since the original review used an AMD card to drive 240hz, I’d be interested to see your findings with the latest from team green for comparison.

I’m finding a few issues myself, mainly that going to 240hz introduces a slight fuzziness where especially text and solid lines don’t appear sharp. It also seems also to throw off the colour and gamma, which at 60hz/120hz is pretty well calibrated. It gets even worse if I try 10-bit on top.

Perhaps the monitor goes into an overdrive mode to run at this frequency? If so, I’m surprised none of these issues showed up in the review.