Issue with GPU stuttering under frame cap across every game (RTX 4090 FE / 5800X3D)
Issue with GPU stuttering under frame cap across every game (RTX 4090 FE / 5800X3D)
This power supply is significantly below expectations for a 4090. It delivers sustained power above 400W and spikes can exceed 600W. A unit with at least 1KW capacity would be ideal. However, 4090 models have experienced unusual problems. While it’s the top model, production numbers are low, and the software support is quite limited.
Yup, that makes three: This thread Your thread And this thread
I've observed this too. It might be related to a Windows update problem. I recommended lowering the NVidia drivers to an older version to test. PSUs and even RTX models aren't identical, but the problems are alike. Most users have solid technical skills and have tried standard troubleshooting without success.
Reference: A 1KW power supply isn't needed according to the build specs, but an 850W unit is suggested by Nvidia. It seems someone might have found a case where it worked, though I haven't seen a replacement fix the micro stuttering issue. Usually, PSU issues cause abrupt power cuts due to protection features like OVP, OPP, OPP, or OTP. Spoiler.
This refers to a G-SYNC issue mainly. Have you adjusted your monitors or made any changes? Did it function properly with the original 3080 drivers? You didn’t necessarily need the 4000 drivers, as they are essentially identical. The solution is already implemented—consider skipping G-SYNC altogether. Have you tried using Fast Sync instead? It’s a more stable option that avoids tearing and keeps frame rates steady. Simply put, don’t rely on G-SYNC; it adds unnecessary lag and discomfort. Blurbusters is misleading information. If you’re unsure, try exactly what I suggested: turn off G-SYNC, use VSync or Fast Sync, and stick to your monitor’s native refresh rate. It’s straightforward and works for me too. Good luck!
Just to make sure, it seems like you're trying to avoid using blurbusters, so we should fix that first before we dive into the problem...! Also, the custom power cables are likely the first thing to address, right? Totally understandable. Big no no. I get it—you've put a lot of effort in—yet it still feels like the simplest parts aren't working as expected. Sorry if I'm mistaken; I think there might be an issue with the CPU. My system has a 5800X3D and a 3070, which is perfectly balanced. I’m pretty sure I’m still limited by my CPU in certain games. You won’t always get the same performance with a 4090... it’s not impossible, but it definitely has its limits. The 5800X3D is a solid CPU, but it can’t overcome everything.
No such safeguards would be effective if brief surges are creating a substantial voltage loss, preventing the card from receiving a stable 12v output. If the buyer can invest in a 4090, they should definitely avoid settling for a power supply that falls short of the minimum guidelines provided by Nvidia. I recommend switching to a 1000w power supply as another suggestion was made.
I see your point. The situation you described where the GPU continues to operate despite voltage fluctuations would probably cause crashes or visual artifacts. More likely, because the power supplies are built to manage sudden spikes well beyond steady loads, any notable voltage drop would activate safeguards (as referenced in the video) and/or result in a black screen due to a driver failure. The video even notes that a 750W PSU might struggle with a brief surge... leading to shutdown rather than smooth performance. This is exactly the kind of failure we aim to prevent—microstuttering. I’ve searched online for real examples of PSU upgrades resolving microstutter, even under reduced load, and found nothing confirming improvement. I’ve seen many stories where swapping out a PSU helped, but none that proved it works universally. I’d appreciate someone to provide evidence otherwise, as I did in my original comment. I just don’t believe it’s wise to recommend a purchase without solid proof it will help.