Asus EAH5870/2DIS/1GD5/A, code (90-C3CH30-L0UAY0KZ) easy success. Looks and maybe is a reference card.
Installed ATY_Init.kext, ATI kexts (1.6.18.13) without rebooting, repaired permissions, rebuilt cache.
Shutdown, replaced the card, connected my 2 monitors (different resolution).
Success...