X570 Taichi PCIe working at x8 instead of x16

Xaltar wrote: That is very odd. Are you sure the lower portion of the card is slotting in all the way and the card's cooler isn't fouling on something? The end furthest from the rear IO. If you have the option, try testing a different GPU and see if that gives you a full PCIe x16 connection.

Quite sure.

I have an old gtx970 lying around somewhere, I can try it out. I'll report the results

Ok, tried cleaning and examining everything. Still no luck

Ok, so the next step is to remove the GPU and clean the contacts, I usually use
isopropyl alcohol and a cotton bud. Make sure they are all shiny and clean with
no residue. You can also check inside the slot and make sure there is no debris
in there. Once you have done that, make sure you install the card all the way
into the slot. If the back end is not all the way in you will lose PCIe lanes
to the GPU. PCIe x1 is the first section of the slot (matching the PCIe x1 slots)
then x4 is the next collection of pins etc all the way moving outward to the
back end of the slot to PCIe x16.

This is the most common cause of limited connection width, the card not being
fully seated.

Good luck and let us know if it resolves the issue.

If you click the little "?" next to bus interface it should start a render test
that will load the GPU enough to trigger it out of power saving. Does the link width
change when you do this? (PCIe x8 should become x16).

The forums are not tech support That said, ASRock Tech Support does often post here and check on things.

I take it you are using the top most PCIe x16 slot? If not, that is your problem.
The lower slots are wired as x8 and x4 respectively. While the slots are physically
x16 they are not wired that way. Only the top PCIe slot is capable of x16.

As for the PCIe generation showing as 3.0, you are correct, it is limited to the
generation supported by your GPU.