My powersupply is a 850W corsair RM850i, while I'm at it, here's my full system specs that I should have included in my first post :
Motherboard : asus z97-A usb 3.1
CPU : intel i7-4790k
Ram : 32gb hyperx fury 1600
GPU : asus gtx970 and asus gts 450
It all seems to work smoothly for the first couple of minutes, and I've been using this pc for a year now without unraid and never had this issue.
Thanks,
-Martin