I it's just a little oxidised, either way i used memtest and 0 problemas with ram also use prime95 for 24h and got no problems. If a Bios version is not compatible with the CPU may that causa fps drops?.
If i play games like ps2 emu or dragon ball xenoversei there is almost no fps drops
only notice on dragon ball xenovers, Also Resident Evil Remake HD i have no FPS drops.
If i try to play Watch Dogs doesn't matter the resolution i make it has FPS drops like hell same if i try to play BF4, i tried to play Farcry 4 it was almost impossible.