Approximate cost to access various caches and main

Question

Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?

While this isn't specifically a programming question, knowing these kinds of speed details is neccessary for some low-latency programming challenges.

Answer 1

||~~~| | max 255 for CC-3.5 PAR --

Answer 2

~ 5.5 GB/sec XFER-BW-up ~~~ same as DDR2/DDR3 throughput |

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