Chinese website HKEPC has more details on the RV635 (thanks VR-Zone) which will be officially known as Radeon HD 3600 series. RV635 architecture is similar to RV630 with 24 stream processors, 120 stream processing unit, 16 Texture Address Unit, 8 Texture Filter Unit, 4 ROP and 128-bit memory interface. However, RV635 PCB is different from RV630. There will be RV635 XT and RV635 PRO to be officially known as Radeon HD 3670 and HD 3850. HD 3670 will be clocked at 800MHz core and 1.6GHz memory and 3650 will be clocked at 600MHz core and 1GHz memory. The current revision of the RV635 GPU is A11. HD 3670 card is expected to sample in December and launch slated for January while HD 3650 is slated for end February.