get refund and buy a 780 ti. (I bet that was your plan)
It's a real shame tbh I've been with nvidia since my fx5200 and had a 680gtx before this but thought I'd give amd ago as the 290x is a great price + performance card but it's been a nightmare.
Never have I seen my pc be so unstable, just constant hardlocks, blackscreen , driver issues the lot.
Got to the point where I was question my own pc so I tried it in a mates and bam it blacked screen quicker than it did in my pc lol