Motherboards.org has posted a review of Ultra Products X2 PSU, with it's 120mm fan, modular flex force cabling and dual PCIe cables.  Even with dual 6800's running through 5 interations of 3DMark05, the power barely flucates.

If you are worried that 550W won't cut it, make sure you read Lee Garbut's review of the BFG 600W PSU, it is a beast.

"What impressed me the most was that even while holding down a high powered SLI setup, voltages

didn't fluctuate all too much more than normal, and noise levels didn't budge. Considering the

stylish casing and clean modular cables, there's no reason not to put Ultra Products' X2 Power

supply up there on the list when you're searching for something new to power that hungry setup!"

Here are some more Systems articles from around the web:

SRC="http://www.pcper.com/site_gfx/icon-system2-small.gif" ALT="Click Here to go to Systems"

border=0>

  
Systems

• SilverStone

Zeus ST56ZF and Strider ST56F Power Supplies @ SystemCooling

FSP Group GreenPower 400Watt

Power Supply @ LAN Addict

TARGET="_blank">Cooler Master Real Power 550W PSU @ PC Apex

TARGET="_blank">Be-Quiet P6-470 Darkpower review @ DH

TARGET="_blank">Ultra Products 2nd Generation X-Finity 600W PSU Review @ Bigbruin.com