What power supply for GX2 board ?

I have received a single 9800 GX2 board.

I already have a desktop with a 550 W power supply.

Will it be a problem when I remove my existing old
graphics card with this new 9800GX2 board ?

Regds, Jay

I read a review today that the 9800GX2 needs a 6 & a 8 pin PCI-E connector. Otherwise it will not run, so you will need a PCI-Express V2 capable power supply.