Athlon 2 x4 640 BF4 bottleneck?

Bapaluba

Honorable
Feb 7, 2014
1
0
10,510
Hi,
I have a overclocked Athlon 2 x4 640 running @3,2Ghz / stock Cv (OC) Stock is 3,0Ghz / stock Cv
My GPU is GTX 660

When I run BF4 my GPU is @ 45-55% load. But my CPU spikes bigtime.

Anyone know how I can SAFELY OC my CPU to like 3,4Ghz with the original coolerfan?

Thank You!