This $699 dual-GPU card is amazingly quiet during full load but can't best AMD's Radeon HD 6990.

"Nvidia's long awaited Dual-GPU video card is finally here. The GeForce GTX 590 is designed for enthusiast gamers that need the highest graphics performance and image quality from a single video card. The GTX 590 is a DX11 based video card designed to allow users to turn up their graphics settings--including resolution, anti-aliasing, and image quality--without causing excessive performance decreases which would otherwise render games impossible to play. With full control over Nvidia's driver game presets and other graphics features, users can also enjoy image quality customization which would allow them to use up to 64x anti-aliasing with a single GTX 590 and up to 128xAA with two GTX 590s combined for Quad SLI. The user needs to over-ride the application AA through the Nvidia drivers. Once that is done a Multi-GPU 64x AA is possible with a single GTX 590."



Link: Bjorn3D