Clarify this for me, please

[Pla123]

You do know that Core 2 Duo has a shared L2, there is no L2A or L2B just the L2. Of course Core 2 Quad is 2 C2D processors in the same package linked together by the northbridge. C2Q does have 2 L2 caches but Windows will schedule each task to each C2D die, will it not? Which is still useless for a 4 threaded application.

Anyway I think this extract from the Efficient Data Sharing in Intel Core Microarchitecture Based Systems presentation backs you up:

"Frequent modified cache line sharing is bad
• Intentionally – e.g. synchronization
• Mistakenly - False Sharing"

A limitation of MESI?

Thanks for the correction.

So my comment doesn't apply to C2D, only to C2Q... which implies C2D should be as good as Phenom on synchronization...