My top PCIe slot has not worked since I acquired this mobo from a friend. I have been running my AMD RX 480 8gb card in the bottom PCIe, but was wondering if that has any effect on the performance I am getting playing games. If I understand correctly, my top is PCIe 3.0 x16 mode and the bottom is PCIe 2.0 x4 mode. Does that mean my GPU is getting 1/4 the potential performance, or would it not be that noticeable of a difference. Trying to see if it would benefit me to purchase a new mobo or not for slightly higher fps in games like Warzone. Thanks in advance!