AMD today announced the ATI Radeon HD 4600 video cards for mainstream gaming and HD multimedia performance while consuming less power than a standard light bulb.
Comprising the ATI Radeon HD 4670 and the ATI Radeon HD 4650 graphics cards, the ATI Radeon HD 4600 series leverages the technology found in the ATI Radeon HD 4800 series, including support for the latest DirectX 10.1 games.
The ATI Radeon HD 4670 and ATI Radeon HD 4650 graphics cards feature AMD’s TeraScale graphics engine, with 320 stream processing cores, and are based on AMD’s advanced second generation 55nm process.

The ATI Radeon HD 4670 is immediately available with a frame buffer of 512MB GDDR3 memory with an MSRP from USD $79, while a 1GB DDR3-based variant is scheduled to ship later this month.
The ATI Radeon HD 4650 features a frame buffer of 512MB GDDR2 memory and is expected to be available later in the month at an MSRP from USD $69.
Via this AMD press-release.