Sapphire today announced its Radeon HD 4730 accelerator. The new GPU surfaced along with Radeon HD 4790. Together these GPUs fill the Radeon HD 4700 series, bringing relief to the demand Radeon HD 4770 created, but is apparently unable to meet due to technical problems with the 40 nm manufacturing node of foundry partner TSMC.

The Sapphire Radeon HD 4730 uses a PCB that is pin-compatible with Radeon HD 4870, as it is based on the same RV770 core with a different configuration. The company used a simple cooler with radially-projecting aluminum fins, which it has been using on inexpensive models of the Radeon HD 4850, and HD 4830. The memory is subjected to its air-flow, while the VRM area has a heatsink of its own. The GPU has 640 stream processors enabled, with a 128-bit wide GDDR5 memory interface, holding 512 MB of memory. Sapphire cut down on the number of memory chips used, thanks to the narrower memory bus, while maintaining the memory bandwidth of similarly clocked 256-bit GDDR3. The core is clocked at 750 MHz, while the memory is at 900 MHz (3.6 GT/s effective). The outputs provided on the card are DVI-D, D-Sub, and HDMI. The card takes its power input from two 6-pin power connectors. The card uses a 3+2 phase power circuit. The Sapphire HD 4730 is expected to be priced at 80€.

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.

AMD is on course of releasing the industry's first GPU built on the 40nm silicon process: the RV740. Its specifications make it a cheap yet powerful GPU for the segment it is about to cater to. With the earliest pointers hinting at 640 stream processors and a 128-bit wide GDDR5 memory interface. The GPU also marks the industry's first mainstream implementation of the GDDR5 standard.

Fresh details emerging out of the inspection of the driver information files of ATI Catalyst version 9.1, as German website ATI Forum finds out, hints at the possibility of the RV740 being implemented in two SKUs: the Radeon HD 4730 and Radeon HD 4750. While in the driver file, the device string lists with "RV630", it can be seen throughout the file that several strings are assigned to the same RV630, and is merely a means to identifying a whole class or generation of graphics processors to the driver. Additionally, the string bears the device ID of the RV670, again, that's not relevant. The strings are what matter. The RV740 is not very far away from large scale production. It should become a reality by the upcoming CeBIT event, in March. From the view of being a mere postulation, RV740 being the GPU that goes into making the new SKUs, does end up sounding plausible. When released, these cards are intended to further strengthen AMD's market position in the sub-US $150 market.