CPU Overheats when i overclock my gpu and crashes?

silver4260

Honorable
Dec 5, 2013
9
0
10,510
hey guys. my cpu runs at around 43 degrees idle and when i overclock my gpu by 100 mhz , my computer crashes the game and nothing works. so i restart my computer and i get an error "CPU temperature overheat" or something like that. whats the problem ? the cpu cooler is screwed in as tight as possible and all that. i dont know what the problem is. this build is 1 month old. i dont even over clock the cpu because im afraid of the temperatures ill get

asus maximus hero mobo
4670k cpu ( 3.4 Ghz )
NZXT Phantom Full size chassis
NZXT t40 respire cooler
stock nzxt t40 thermal paste
EVGA gtx 770 gpu ( 100mhz O.C. )

*i play assasins creed 4 on ultra so if i dont overclock i get low fps

please help guys. should i buy a water cooler ? should i reset my cooler ? should i reapply A.S. thermal paste ? HELP PLEASE