careful man, watch your heat , monitor the crap out of that overclock to make sure your whole system is running stable now. get a Hardware MOnitor from CPUID. It will run stable at idle , its when you start stressing your machine is when you will start the overheating problems.
I used prime to stress test the system for 20 mins. Maks cpu core temp was 80, average 75. When playing crysis or modern warefare the maks temp on the cpu was 58 degrees C.
Im no expert, but think this should be safe.