I know I shouldn't have bought 2nd hand gear but I'm cheap and I'm now in trouble. 3 weeks ago, I bought a new 2560x1440 monitor and upgraded my HD7950 by a 2nd hand R9 290 tri-X bought on eBay My build: - Cooler Master 700W PSU - Asrock Z77 extreme 4 - i5-3750k OC I had a few driver crashes/black screens lock outs that were solved by raising the GPU core voltage by 25mV. Beside that it worked well for 3 weeks. With plenty on offer on ebay, I decided to go crossfire and bought another R9 290 tri-X on ebay. I also purchased a 2nd hand Seasonic 1250W for half the price of a new one. Here is what happened. Got the new GPU on Monday. Installed it and tried it a single GPU. Everything ran fine for about 2 hours until a dreadful "pop" noise followed immediately by the house mini circuit breaker tripping on overcurrent. Got the new PSU the following day. Tested fine with an old screen and onboard graphics (no GPU) I installed both cards. Set up and benchmarked performance for Crossfire. All going fine for a couple hours of gaming. Went to bed happy. Went back from work today. Started the computer. "Pop!" straight away, house supply tripped on over current. PSU is dead and won't pass the paperclip test. Am I incredibly unlucky with Power Supplies or can a faulty GPU kill the PSU? Is there such a thing as an intermittent short on the PCI-E 8 and 6 pin circuit? Help!