Corsair HX650 and R9 290X

Ok so long story short I have been going through a series of RMA's with video card vendor. They are saying that they believe that my PSU may not be strong enough to handle a R9 290X which requires 2 6+2 PCI-E connectors.



I say they are full of it because the card worked for a few hours of gaming upon installation and the video stopped next day while surfing the web. I placed another card in the system and it is performing without any issues.



I have had this PSU for about a year and it is powering a stock 4790K, a Z97 motherboard, 4 sticks of ddr3-1600 ram, 1 SSD, and 2 5900 RPM 2 TB drives.



Do you think that the card is the problem or my PSU?

Corsair HX650 and R9 290X