Random Asymptomatic Crashes

Hello people of the internet, I have recently rebuilt my computer and installed Windows 10. Since, the beast has been randomly hanging and crashing to a grey screen while buzzing the last note of audio.

When I first rebuild it there were some actual blue screens that went along with these crashes. They were all memory related, so I memtested and RMA'd faulty ram. That did not solve the random grey screens.

Is there anything I can do to troubleshoot or find out why these crashes are occurring? The built consists of...

i7 6700k 32g Corsair ram 3000mhz Nvidia Asus 980 Asus Maximus VIII hero 2tb WD HDD 600W Corsair PSU all in an HAF 932 full ATX case running fully updated Win10 and drivers/bios,

What can I do to figure out what's causing random crashes with no blue screen?

Thanks for the read.