Why is that my computer can't stop crashing in this game, yet I've been able to run pic rel at 4k, for the past few hours at like 100+ fps all maxed out?

People keep telling me on the forums that it's my system, but if my system were shit and broken then it would probably have a system failure running this. What else would i need to prove that something is terribly wrong with Dices game? install Space Marine?