Tech ARP published a guide about How To Fix The PCI Express X1 Bug.
User of ASUS and Gigabyte motherboards (maybe others as well) may be affected by a PCI Express x1 bug which causes a tremendous drop in performance. ChampionLLY takes a look at the motherboards and graphics cards affected by this problem and what solutions work, and what doesn't.How To Fix The PCI Express X1 Bug
In the second part, he takes a look at the effect that PCI Express x1 bug has on the performance of your system. The results will shock you.