900MHz clock for extra measure
Back at CeBit were Sapphire showed off its overclocked HD 5970 Toxic with 4GB of GDDR5 memory, claiming that it was the fastest graphics card on the planet.
Well, the rabid 5970 is finally here and it seems Sapphire wasn't exaggerating. The card boasts two RV870 GPUs clocked at 900MHz, an impressive 175MHz overclock over the reference card. Furthermore the memory was bumped up from 1000MHz to 1200MHz, allowing for an even higher performance boost. Thanks to the generous overclock, Sapphire had to resort to a massive three-fan, three-slot cooler with a bunch of heatpipes.
Fudzilla