Over at a Chinese website they obtained some cool photo's of the ASUS ROG 5870 Matrix, the card comes with a 2GB framebuffer. Apparantly it operates at 900 MHz on the core clock and memory at 4900 MHz. The card will come with voltage checkpoints to monitor the juice flowing through the card.
Apparantly it can cram 1.5v through it's pipes allowing a clock frequency of 1080 MHz.