[H]ard|OCP has assembled a review of the two best GPUs on the planet, in triplicate.  It got off to a rough start as there is a serious issue with the last several Catalyst drivers, preventing you from using EyeFinity on Tri-Fire systems so they needed to revert to the release candidate that appeared back in January.  The NVIDIA machine was easier to configure, once they realized that for triple surround they had to stay to one monitor per card.  The PCIe lanes were provided by the ASUS P8P67 WS Revolution, which allowed these cards to really show off their stuff.  Make sure you check out the power consumption page, you may be very surprised at how little power the GTX680s needed to run.

"What do you get when you install three GeForce GTX 680 cards for 3-Way SLI and then three Radeon HD 7970 cards for Tri-Fire? You get insanely fast gaming performance and a gameplay experience that begs to be compared delivered by both. We find out which multi-display configuration is better for gaming in Eyefinity and NV Surround."

Here are some more Graphics Card articles from around the web:

Graphics Cards