I recently had an Issue were my pc randomly got fps drops I sent back my gtx 980ti and got a new one replaced I now have the same issues. I uninstalled the old drivers and clean installed new ones. My on board graphics works fine but when I have my 980ti in I'm getting the same if not worse performance then when I was using on board. I'm starting to believe it's my mobo can my pcie slots affect this. Specs
Cpu: i7-4790k gpu: gtx 980ti sc+ acx2.0+
Ram: 16gb gskill Aries 1866 Mobo: msi z97s kraft edition mobo