Hi guys, I am looking for an answer for the above question since I decided to buy MSI Radeon R9 280X Gaming Edition OC. I cant found the PSU requirements for this card on the site and not on the internet. I found out that Sapphire cards from the R9 280X series needs 750W PSU recommended on their manufacturer site, but cant found nothing on the original MSI site.. lol? Anyway another website suggest 550W PSU for the whole R9 280X series so I get a little bit confused. I am just about to buy this card if my Corsair GS 600 PSU manage to handle it.. if not I can only go for the R9 270X series. Thank you very much for your answer in advance!