Hello folks, im new to this forum and was wondering if someone could give me some advice. I was thinking of buying a Zotac 560 TI AMP , but im unsure wether or not my pSU could take it. My set up is as follows: 550 W PSU AMD Phenom II black edition 965 x 4 ASUS M4A77TD pro motherboard 8 GB 1333mhz dual channel ddr3 sdram 2 x HD drives DVD R/W At present i have an ATI HD 5770 in there. Would i need a new PSU to change over the graphics card or would th 550W be sufficiant? Thanks for looking.