For a quick overview of what comes included in each system, see the Intel® Server Board S2600GZ and S2600GL Family Decoder or the complete summary chart in the Spares, Parts List, and Configuration Guide.
The below is an excerpt from the complete Memory and Hardware Compatibility list for your convenience.
1 Discontinued; no longer available for order.
2 To be discontinued October 15, 2015.
See the Intel Quality Document Management System for Product Ordering and Replacement Options.