Well.... when you have this comp right here: Ok… let's start with everything….
CPU's- two amd opteron 275s (two dual cores! That's four cpus! That's like a clock speed of 8+ghz!
Mobo- tyan k8we This mobo supports 16GB OF RAM! Yeah… it's sli too.
Ram- 16gb of corsair registered ram, ballistix…
Videocards- two 7800gtx
Monitors- two dell 24†lcd widescreens
Psu- pc power and cooling turbo-cool 1KW psu
Hd- 5 hitachi deskstar hd's at 500GB EACH! THAT'S TWO TB's!
Raid controller- sata netcell revolution
Optical drives- two plextor px-716sas with sata interface…
Sound card- creative sound labs sound blaster x-fi (24 times better than the best sound blaster card out right now)
Speakers- logitech's z5500e's
Keyboard and mouse- metadot keyboard and logtiect mx518
OS- Microsoft xp pro
You kind of need a big psu...