55nm RV770 & G92b Die Sizes Comparison
Our good friend CJ told us some time ago about a die shrink on the G92 from65nm to 55nm codenamed G92b and it is evident from theinformation we gotten yesterday that Nvidia is preparing a shift to 55nm onsome of the upcoming mobile GPUs. However, we have yet to find out if there willbe a shift to 55nm for the desktop parts.
Assuming G92b has no architecturally changes, it will be 17% smaller than G92thereby it is cheaper to produce and better yield rate. Assuming the rumored diesize of RV770 of 250mm2 from Chiphell is correct, this will put itsdie size about 1.29 times bigger than RV670. That could due to an increase inthe number of stream processors and ROP and other architecturally enhancementsthat makes the die larger. In comparison, G92b die size is slightly larger thanRV770 by about 10%.
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