Pay close attention to the X server log output from ATI's Linux driver, as we did recently with a FireGL V7350, and you'll see mention of support for what we believe is a brand new class of product featuring a modern graphics processor.
Listed in recent drivers is a SKU called FireStream 2U, apparently powered by ATI R580 and given away by the following strings: FireStream 2U (R580 724E), FireStream 2U (R580 724F).
Beyond3D
Beyond3D