From the Volarigamers forums
As for the Volari 8600, it will feature TruShader 3.0 support (Shader Model 3.0).
3 versions are on the way :
- Volari 8600 XT : 450MHz core and 450MHz memory, 192bit memory interface, maximum memory capacity 256MB
- Volari 8600 : 400MHz core and 275MHz memory, 128 bit memory interface, maximum memory capacity 128MB
- Volari 8600 Mobile : MXM-III module, 350MHz core and 300 Mhz memory, memory interface 128bit, maximum memory capacity 128MB.