Matt Dobe :
I think the cooling isn't great on the XFX. Download HWmonitor and check your temps whilst gaming. What temps are you CPU/GPU getting?
Sounds like overheating throttling. Also, what is your power supply make/model power?
Ok I'll have to download that.
When I was in the BIOS earlier it said my CPU was running at about 50°C but I'm not sure about my GPU.
My power supply is a corsair 750w.