Hello,
I've recently had an issue with my build. To prefix, the build has been running fine for a few months now without issue, but recently I've notice that the graphics card has been stuck at 8x PCI-E when I had an underperforming benchmark test. I am aware that the bottom PCI-E 16x_2 runs in conjunction with the M.2_1 slot (which is occupied with a Gen5 M.2 right now), but that shouldn't affect the PCI-E first slot from my understanding. I do have a PCIE5.0 riser installed, but have tested it in another rig already and it worked on 16x speeds on a different board. I used GPU-Z test to ensure it wasn't just the GPU bios placing the card on 8x under no-load. Power savings features on Windows have been disabled.
I've tried adjusting the onboard settings in the bios but found no way to "force" 16x on the first slot. I've considered the alternative of removing the M.2 on the first slot and sliding the card down to the second slot (I understand you can't have the m.2_1 and second PCIE16x slot occupied without the channel being force 8x), but as it's a custom liquid cooled rig I would have to reset all the hard tubing to do so. I wish to inquire to exhaust all my options first. Specs for the build are:
Intel 14900KS
Asus ROG Maximus Extreme Z790
Corsair Dominator Platinum 96GB (2x48GB) DDR5 6600MT/s
EVGA 1200watt P2 PSU
Corsair Gen5 m.2 in slot m.2_1
Samsung 1-2TB m.2s in the other m.2_2/3 slots (DIMM.2 expansion slot is also loaded)
Aorus Nvidia RTX 4090
I would appreciate suggestions. Thanks again!
