4 Way Opteron: HP Unveils Opteron-Based Server

PCWorld.com - HP Unveils Opteron-Based Server
hmm, is hot Swap memory DIMM's necessary if you build a redundant cluster?

It will also be less expensive than the Xeon system. An entry-level two-processor configuration of the DL585 built with AMD's fastest-performing 2.2-GHz Opteron 848 processors will cost $11,999, Cumings says. A similar configuration of the DL580, based on Intel's fastest processor--the 2.8-GHz Xeon MP--will list for $15,798, he says.