Since PCI Express x16 has been in existence that allows NVIDIA's Scalable Link Interface and ATI's CrossFire to coexist, there has been a growing need for suitable power supplies. NVIDIA's new Quad SLI has also caused a greater power roar, now needing to provide enough power for four high-performance GPUs. According to NVIDIA's SLI Zone, for a dual GeForce 7800GTX or 7900GTX system, a 500W or 600W +12V@30A is needed to feed the various PC components.



Link: Phoronix