I recently switched cases and therefore had to take my rig apart and put it back together. When i booted up the red light for GPU on my motherboard flashes when my card is in the primary pci slot (the one closest to CPU). When I change it to the secondary slot it works but my fps is significantly reduced for some unknown reason, tried re installing drivers but to no avail. If anyone could help me with the issue of my gpu not working in the primary slot or the issue associated with my FPS drop (mainly for WoW) I would be greatly appreciative! Thanks