AMD is dressing up a new ATI Radeon SKU to go to office soon. The Radeon HD 4730 beats our guesswork, and wits both in one shot. The new SKU is not based on a scaled-down 40 nm RV740 GPU the HD 4770 is based on, but rather on a new RV770 variant, dubbed the RV770CE. This GPU is physically identical to the RV770, and has part of its configuration identical to the RV770LE (Radeon HD 4830), while its memory interface is 128-bit GDDR5 instead of 256-bit GDDR3.
The only explanation we have in store is that perhaps AMD is looking to save on using lesser number of memory chips per board (while not crippling the memory interface), and that RV770 is in healthier stock than the RV740. Pictured below is the PowerColor Radeon HD 4730 PCS, one of the first cards based on the GPU. Other important specifications, such as stream processor count, and clock-speeds are yet to surface. Ideally it should cash-in on a price-segment below that of the Radeon HD 4770.