I got some new pics of Asus ROG Matrix 5870: PCB and cooling solution:



12 phase PWM (8 for ultra-low leakage Cypress GPU, 2 for IMC and 2 for GDDR5)



2GB of memory, total 16 chips



5 heatpipes and improved fin-area



Heatpipes directly in contact with Cypress GPU



Thicker fan (21,5 mm)

Source & pics of AMD's 5870 reference cooling: Muropaketti.com