ARK states that Xeon E5-2400 processors have Smart Cache; for Xeon E5-2600 processors there is no information.
Do Xeon E5-2600 processors also have Smart Cache?
The Smart Cache of the e5-2600 series Intel processors is 20 MB, it is called Last Level Cache (LLC). You can find information about it on page 15 at the Product Datasheet:
Retrieving data ...