There is a leaked pdf presentation floating around the internet from a presentation about a Sun/Intel alliance, and it has some juicy details about the upcoming Dunnington server processor from Intel.

The Dunnington is based on the Penryn micro-architecture, and is expected to be the last server processor from Intel to be based on the Core micro architecture before Nehalem is unleashed.

Dunnington is going to be packaged in Socket 604, and as such is supposed to be compatible with a range of existing server boards for Tigerton based Xeon's. With a 130W TDB, Dunnington is a good choice for blades and other densely packed servers.

Dunnington has six single-threaded cores, with each core having a 3MB L2 cache. All six cores share a very large 16MB cache. The new SSE4 instructions will be supported, and the chip has 40 bit physical addressing allowing for a massive 1TB of memory.

The 1066MHz FSB will be the greatest limitation of the design, but given the shared L3 and new bus interface unit, it should not be difficult for Intel to offer Dunnington with a 1333MHz or 1600MHz FSB should it choose to do so.