Need more info man.
What PSU?
What Clocks?
Powered extender or not?
Mobo?
etc...
I wasn't sure what info was needed. Anyway here,
Generic brand 450w psu for system, shares a Seasonic x-1250w psu with another single 5870 machine
This psu powers a tri-core system with 2 hdds and 3 5870s and 1 5970.
950 engine 328 mem on the intermittent card
Powered Extender
Asus m4a785-m with a broken disk controller