ASRock A770CrossFire Motherboard Review
Posted on by Thomas De Maesschalck
ASRock approached with maximum creativity and decided to squeeze everything possible not only from the Southbridge, but also from the Northbridge: they installed the 2nd graphics port and added nominal CrossFire support (8x + 8x), although only 790X and higher-end chipsets officially possess this feature.
Link: Xbitlabs