The forum has a search box… post#16 of the following thread
“Could that be handled in a BIOS mod too?”
Thats not bios mod related, OS drivers or OS corruption, mb hardware issue or connected peripherical.
Be advised, that you won’t have PCIe 4.0 from adapter/disk itself, the Z87 only supports 3.0 and only in 1rst PCIe slot (GPU), all others will work @ 2.0x4 with a discrete GPU.