So this is kinda weird. On cold boots CPU-Z and GPU-Z report the PCIe link state as x1 4.0 (Regardless of load or power state), and GPU performance is degraded. If I restart the system it will correct itself and run at x16 4.0, HOWEVER, if it goes to sleep, it will revert back to x1 4.0 on resume.

Fresh Windows install, latest drivers, latest BIOS.

I've tried every power setting I can think of, disabled quick boot, the BIOS options for PCIe are limited and I can't force x16 or anything like that, but when I try 8x4x4 it displayed the same behavior with x8.

MSI B650-P Pro, 7700x, 4070 TI, DDR5 6000 CL36

I'm kinda leaning toward a motherboard/BIOS issue as the issue is reproducible, and the system works perfectly at x16 indefinitely until the system is shut down or falls asleep.

Update: it seems many people are having similar issues. I wanted to update you all on my journey. I thought a bios rollback fixed it, but then I started to notice it was training to x16 3.0. Restarting fixed it, and it seems like not every sleep cycle causes it to go to 3.0 speeds, maybe 1 in 4. Sometimes it will go to 3.0 on the first sleep, other times it will be fine for a week. I have been checking it before I start gaming and restarting if needed. I also upgraded to the very latest BIOS since it seemed staying at 1.0.0.7c no longer fixed the problem. On latest bios I see the same behavior. Luckily it is going to x16 3.0 which is a lot better than x1 4.0.

Update 2: people are reporting 1.1.7.0 fixes the issue. It is not available on all boards yet, including mine, but if it’s out for yours it’s worth a try.