Intel Details Nehalem uArch Improvements - 256KB L2, 8MB L3 Confirmed

[Shadowmage]

This is what Franck (CPU-Z author) as to say about Nehalem L3 cache speed. I'll take his word.

Sure, it'll be faster than the current Penryn cache, but not by that much. There's no way it'll be under 10. My guess is a 12 cycle latency.