Excellent info, very informative. I don't have any Xeons but it was still quite interesting.
Thanks for identifying the 256K L2 dependency, I wasn't previously aware of it.
To make matters worse latest xeons have more than enough of L2 but guess what... some L3 is missing.
To be on topic, XEON... CACHE, FREQ'S OR CORES?, perfect answer is FREQ x CORES without HT.
OT: Most cpu-algos are not L2 limited, must Do Your Own Research.