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Question: By what scalefactor is CPU cache faster than memory running at modern bus speeds?
Asked by Will (24.234.128.x) on January 3 2011, 11:00am
Reply on January 3 2011, 8:04pm:

If I had to guess, the latency on memory in cache would be 1 cycle (for L1, I'm not sure how it works these days with the various caches, but the others may be close to that), and for going across the memory controller to DDR, probably something like 10-50x that. I'm pulling those number out of my ass, though.

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