The new Radeon HD 4600 series is basically a watered-down version of the high-end 4800 series that launched a while back. The initial line-up comprises the 4650 and 4670, each packing in 320 unified shader cores and built using 55nm process technology. As you might expect, these cards also include support for DirectX 10.1 and Shader Model 4.1, ATIís CrossFireX multi-GPU technology, enhanced HD multimedia capabilities and good performance-per-watt.
The basic Radeon HD 4650 is estimated to cost as little as $69 and does so by using 512MB of GDDR2, whereas the Radeon HD 4670 is only slightly more expensive at $79 and switches to faster GDDR3 memory.
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