Recently I'm running my AMD Phenom II X4 965 at almost 3.7 ghz wich went pretty good, but after a while the CPU Cores went constantly at full power.. Even when I'm at idle!
Usually the cores were at 50% (like 1.8 ghz), but now they're all running at 3.7 at all times.. Temperatures got real high up to 66 degrees celcius when playing BF3 at ultra.
Asus Sabertooth 990fx r2.0
AMD Phenom II X4 965 @ 3.7 ghz
MSI GTX 680
Antec Kuhler h2o 920
600 Watt Coolermaster Silent Pro