Full Details from Amazon.com : http://www.amazon.com/gp/product/B007FPITV0?tag=onigi-20

Diamond Multimedia AMD Radeon HD 7770 GHz Edition PCIE 1G GDDR5 Video Graphics Card - 7770PE51G

You deserve to play the worlds most demanding games at the highest resolutions and maximum detail settings AMD CrossFire can help you get there with performance thats up to 2x faster than a single GPU
PCI Express 30 is here and the AMD Radeon HD 7700 Series is ready Get superior performance with multi-GPU configurations thanks to unprecedented bandwidth and AMD CrossFire technology
Never settle for medium Crank the settings and experience your favorite games in uncompromising detail with AMD CrossFire technology
Get advanced AMD CrossFire support for the latest games with AMD Catalyst Software Suite Application Profiles