Cache dont use much power....On the old P4 Xeons with 16MB L3 it was 0.75W per MB at 3.73Ghz if im not mistaken. Logic is the heavy power consumer. Not cache. You can also see on thermal charts on dies that the cache areas are relatively cold.
You can also compare the power consumption of different cache size chips of the same archtecture.
I doubt another 5W or so wouldnt tip the iceberg if it added 5-10% more performance.
Bookmarks