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209

answers:

1
+1  Q: 

L2 cache memory

What's the difference between 2*512 KB L2 cache and 1 MB L2 cache?

+5  A: 

First one could be dedicated for dual core, 512 KB each core and the second could be shared, if more than one core?

Fredou
A single L2 cache shared by both cores is more difficult to implement. That's why each core has its own L1 and typically L2 cache. L3, when present, is typically shared since it is used less frequently and it is slower.
Brian Carlton