It's now clear that AMD will go directly to 40nm and aim for a performance per watt ratio twice that of RV770. RV870 has been code-named "Lil Dragon", which does indicate that this will be something small, yet something very powerful .
The overall performance has been suggested to be somewhere around 20% better than RV770 with a significant drop in power consumption. This points to 960 shaders (192x5), 48 texture units, 24 ROPs and so forth. If this is the case, TDP of the RV870 should be around 150W at most with today's frequencies. This is just an estimate on our part as technical specifications are still hard to come by.
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