Due to the release of PCI Express, a warrant is issued for upgrading your current power supply, simply since in most cases your ATX PSU can't handle the demands that come with PCI Express and the new LGA 775 processors. ePower has just recently released a brand new power supply, the Xscale-600 that provides a whopping 600 watts of power, support for AGP Pro, PCI Express, and 20, 24, 8, and 4 pin connectors for your motherboard!



Link: Phoronix