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"ATI just announced its new mainstream graphics cards, the Radeon HD 4670 and 4650. At the heart of both cards is a 55nm 320-core TeraScale GPU, which is a modified version of the RV770 chip found in the Radeon HD 4800 series -- it's a lower spec chip, but it has essentially the exact same feature set. The $80 HD 4670 has 512MB of GDDR3 RAM, while the $60 HD 4650 uses 512MB of GDDR2 memory; both are relatively power-sipping with 60 watt and 50 watt draws respectively under full load. Should be out soon -- HotHardware just tested an HD 4670 and found it to be quite a performer, check it all out at the read links.  Read - ATI Radeon HD 4600 series PR Read - HotHardware test"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/09/10/ati-radeon-hd-4670-and-4650-released-tested/>