What do you need a 1300w psu for?
Agreed - what kind of rig are you building?
Loved reading on Anandtech about a boutique system build with a GTX580 and a 2700K overclocked (fairly poorly - way too much voltage on the CPU) with only have a Seasonic X-660 80 Plus Gold 660W Modular PSU. Most people spend way too much on a too powerful PSU and then spend more on electricity b/c other than gaming they are at only 10-20% load.Anantech boutique build review
Ouch, too late with my post - 3 7970's - a beast!