Help with CPU overclocking needed! OCing results in pc crash

Hey i have recently tried overclocking my cpu with a program i have (easytune5). Now i have a AMD 3800X2 and have been attempting to overclock it from 2.0GHz to 2.2GHz. This shouldntbe a problem as i have about 8 fans inside my computer, 3 of which are directed onto my CPU (which also has a heatsink). I overclock it and it all works fine, the temperature isnt that high (about 31 degrees celcius) and everything seems to be fine. However after a couple of minutes the computer just crashes.

Can someone tell me why this is happening? I was using a mode called "easy mode" at first but to my knowledge that only increased the FSB and not the voltage so i tried using advanced mode slightly increasing the voltage. It lasted for a little longer but then crashed again. So also can someone tell me how much i should be increasing my voltage by for overclocking a CPU 200MHz more?

My specs:
AMD 3800X2
eVGA 7800GT CO edition
1GB PC3200 ram
Gigabyte GA-K8N-SLI Mobo
200GB HDD at 7200RPM
LG x16 Dual Layer dvd burner
x8 internal case fans

here are some pics: