So im looking to upgrade my GPU or to an GTS450 or to a 5770 and i was wonderig if this PSU will do :GIGABYTE Superb P450P-C2, 550W, 12CM FAN, PASIV PFC, 2xPCIe, 6xSATA, OPP/ OVP/ OCP/ OTP, ATX2.3 12V+If i would benefit more from the ATI since I run and AMD.Thanks in advance.