if you can see it turboing to 3.9GHz... disable turbo mode and change the core clock to 3.9GHz. problem solved. although i would try 4ghz and run a few stress test and play some cpu demanding games like crysis 3, and if you BSOD, change it back to 3.9, i had to do this on my old 8320 on an M5A97 LE R2.0 Mobo. Although use an aftermarket cooler.