BMR checked out NVIDIA's latest.

"Designed around their flagship GeForce GTX 580 video card, they've combined two titanic graphics processors into a package roughly the same size, and still manage to produce the quietest dual-GPU video card ever made. With 512 CUDA cores each, two independent NVIDIA GF110 GPUs join to deliver 1024 total cores of graphical processing power. There are six 64-bit memory controllers that offer 384-bit combined bandwidth per GPU, and feed 3GB of combined GDDR5 video frame buffer. All of this is said to deliver comparable performance to the Radeon HD 6990, which is good for gamers, but it does so while using less power and emitting less noise. In this article, Benchmark Reviews tests the GeForce GTX 590 against the AMD Radeon HD 6990 and an entire market of top-end desktop graphics solutions."



Link: Benchmark Reviews