I know what you are attempting and it's not supported.
With 650 Watt power supplies out there (I think I found an 800 Watt unit) there is no need to go where there is no support.
can anyone shd some light on this subject? i want to install 2 p/s i one bax. amd 64 proc. asus mobo w/ nForce 2 chipset... too many periferals