http://en.community.dell.com/blogs/insideit/archive/2009/06/01/firing-on-all-cylinders-introducing-amd-istanbul-in-dell-poweredge-servers.aspxAMD is introducing its Six-Core AMD Opteron processors (code named Istanbul) ahead of schedule and Dell is pleased to offer it in our portfolio including the Dell PowerEdge 2970, R805 and R905 rack servers and the PowerEdge M605, M805, M905 blade serversenCommunityServer 2008.5 SP2 (Build: 40407.4157)