I'm having trouble with rust making my pc crash

I had to reformat my pc because of rust I love rust it is an amazing game and has an amazing potential but I reformatted my pc literally like 5 hours ago because rust was constantly making my pc crash after I reformatted my pc I started playing rust it played fine for 3 hours or so then my FPS drops to like 5 and my pc crashes again I log back onto my pc I start trying to play gmod it instantly crashes I start playing rust payday2 minecraft dayz and they all crashed as soon as I logged on it all works fine until the rust crash happens I will need to reformat my pc again I hope you reading or administrators of face punch know how you can fix this I have a prebuild pc an asuscm6870 PLZHELP