Ok build is 8core amd CPU, 32gb hyperx fury ram, r9 290 with a custom fan. 650w psu.
Games that crash: basically all, but for reference CS:go, Arma 3 breaking point, GTA V, fallout 4 etc.
try running on 8 gbs of ram see if it crashes or run memtest. double check that psu and make sure it can handle that r9 290. btw you did mention what psu you have