The first ES chips are like a dual E6600 Conroe....
1) Quad core
2) Socket LGA775 (to be comptable with all VRM11 boards including the Intel "Bad Axe")
3) Similar to the Smithfield core in that it is two dies on one wafer. Future quad core chips will be a single die once the shrink to 45nm happens in Q3'2007.
4) 2.4Ghz, 4MB L2 cache per die for a total of 16MB L2 cache.