So, I built my first rig a week ago, and something's wrong. About every 2-3 starts of my PC it performs very bad. I've got very good hardware but I sometimes start BF3 or any other game and get *10-20 FPS. Then I just restart the PC, and everythings just right. This happens in every game. I checked my GPU temperatures in MSI Afterburner and they're absolutely ok. Please help me, what could I do?
Hardware:
Intel Core i5 4590
MSI R9 280X OC
8GB Crucial Ballistx Sport DDr3-1600
Gigabyte GA-Z97X-Sli
EVGA 600B 600W 80+Bronze Certified
be quiet! Shadow Rock Slim
Windows 8.1 64 Bit