The Radeon HD 3690 has the same core as the Radeon 3800 series but with only a 128 - bit memory controller and 256 MiB of GDDR3 memory .
3690 was limited only to the Chinese market where it was named HD 3830 .
The Radeon HD 3690 , which was limited only to the Chinese market where it was named HD 3830 , has the same core as the Radeon 3800 series but with only a 128 - bit memory controller and 256 MiB of GDDR3 memory .