3d mark crash on physics test plz help

theinfamoustoast

Distinguished
Jul 25, 2016
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parts:
cpu: Athlon 860k
gpu: Gtx 960 GeForce edition
ram: 8gb 1600 hyperX black

i had before overclocked my cpu to 4ghz which ran fine but when i got my new cooler i have overclocked it to 4.2ghz and eversince my cpu always crashed when i run fire strick physics test, it just loads the physics test and then crashes instantly. is my cpu broken? or is it unstable.

btw my core voltage is at 1.320v, do i need more volatge at 4.2ghz with my atlhon 860k