Two weeks ago I changed my ram from 4GB Kingston ValueRam DDR3 1333mhz ram to 8GB Corsair XMS3 DDR3 1600mhz , but one stick of ram was faulty so its out on RMA. For eight months my rig was running perfectly with no crashes or errors with the Kingston ValueRam , but ever since I got the XMS3 ram my rig is very unstable. The stick of Corsair ram I still have ran four passes of memtest V4.20 (Which took over four hours) with no errors. I am after reinstalling windows about six times in the past two weeks because I was thinking there was something wrong with my windows install , but the problem is still ongoing. Whats happening is every single game I play will only run for ten minutes before crashing. So today I went back to my Kingston Value Ram and the problem is still there. I ran OCCT GPU test for an hour and it ran with no errors. As I type this I have four instances of Prime95 running with two hours with no problems. I will leave that run for another hour. Before somebody jumps in and sys to run prime95 for 24 hours I have to say that running it for that long is redicolous and unneccesary. If it runs for three hours without errors I will run memtest for four passes. Do you guys have any other suggestions of what tests I can run? I am kind of afraid this might be a PSU problem.