I recently upgraded my CPU from a 7800X3D to a 9800X3D, and I'm facing a ton of lag, even when I'm just sitting at idle on the desktop. My setup includes a TUF Gaming B650 Plus WiFi motherboard, 32 GB of RAM, and a PNY GeForce RTX 4080. After the upgrade, I noticed that even simple tasks like opening File Manager cause my mouse to lag severely, and anything with moving animations is just a nightmare. I have already downloaded the correct drivers, updated my BIOS, and even reinstalled Windows 11 with the media creation tool. The lag seems to lessen a bit when idle, but as soon as I start any application, CPU usage spikes to around 40%, causing more lag. In BIOS or Safe Mode, everything runs smoothly. One weird thing I noticed is that when trying to perform a clean install of Nvidia drivers, Windows automatically installs some drivers before I'm finished, which leads to lag again. I'm completely at a loss here!
6 Answers
Don't rush to return that CPU just yet! I had a similar issue after swapping out key hardware. Reinstalling the OS was a good call; you might have to do it again, honestly. Try leaving your PC running overnight at idle. Don't let it sleep or hibernate, just let it chill on the desktop and see how things behave by morning. Oh, and definitely check for any BIOS updates!
Have you considered clearing the CMOS? Resetting the BIOS can help reconfigure everything for the new CPU. It might do the trick to resolve those lag issues you're experiencing.
Swapping back to your old CPU might be the best option at this point. Since you got a good deal at Microcenter, they shouldn't give you too much trouble if you decide to RMA it.
Since it seems related to the GPU, have you tried using DDU to completely uninstall the GPU drivers? Sometimes a clean removal can fix weird lag issues after a hardware change.
If I were you, I'd look into reinstalling Windows again. It can be a hassle, but sometimes it resolves all the hiccups from swapping out hardware.
Honestly, you might just want to return that CPU. The minimal performance gains probably aren't worth the hassle and issues you're dealing with.
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