With the mid-range and high-end zones pretty much covered with the Radeon HD 4800 cards AMD is preparing to release a few new, lower end products too. The Radeon HD 4600 series, which consists of the Radeon HD 4650 and 4670 cards, makes use of the 55nm RV730 chip which offers DirectX 10.1 and CrossFireX support, a 128-bit memory interface, UVD 2 and, last but not least, 320 Stream Processors.
The Radeon HD 4670 will be available with either 512MB of memory clocked at 1000 MHz (2000 MHz DDR) or 1GB set to 873 MHz and a 750 MHz core, will make use of a single-slot cooling solution and won't require additional power apart from that provided by the PCIe slot.
The Radeon HD 4650 will feature a GPU clock of 600 MHz and 512MB of GDDR2/3 memory @ 500 MHz but another SKU, with GDDR3 memory clocked at 667 MHz is apparently also in the works.
AMD is expected to officially introduce the Radeon HD 4600 series on September 10.