4850 and 4870 are still based on the 55nm process. The Memory Interface will stay at 256Bit and the ROPs at 16. The number of Stream Processors will increase by 50% to 480 and the number of Texture Mapping Units will be doubled to 32. when idling the 4870 is supposed to draw less than 10w of power.
the new high end model R700XT, or 4870X2 will be similar to the 3870X2. Still a 2x256MBit Memory Bus but now with GDDR5 Memory. just like the 3870X2 its gonna have lower memory clocks compared to the single 4870 version but it has a whooping 250W TDP much like the rumored spec of the 9800GX2.
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