Dell, however, did have a number of comparisons for the new R905 server, which is a four-core Opteron version of the existing four-socket R900. We're told the R905 offers the "ultimate in 4 socket virtualization performance" by beating HP's ProLiant DL580 by 23 per cent on VMmark testing and knocking IBM's x3850 by 8 per cent and Sun's X4450 by 16 per cent on the same benchmark. You can see the results here where you'll note that Dell is the only vendor on the latest update to ESX 3.5. Without the update, Dell's Xeon-based R900 ties Sun and trails IBM.

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