The Gigabyte GV-R587SO-1GD is Gigabytes version of a highly overclocked graphics card. This furhter development has almost nothing in common with ATIs reference design. Gigabytes engineers created an almost entierly new PCB which only carries the best components available. As a result you get a card that does 950 MHz GPU clock default from the factory and paired up with the new cooler it is even more silent than ATIs reference card.