With VM benchmarks set to become a very significant yardstick, especially on larger servers, tweaking hardware to get good VMware, Xen, SWsoft, Virtual Server, Viridian etc scores makes a heap of sense. In briefings for its Barcelona quad-core chips, AMD made it clear that scoring high on virtualisation will be the name of the game for the next several years in high-end servers.
Aside from the fact that Dell sees the virtualisation optimisation taking place in double-socket rockets, the story doesn't have a lot of detail but throwing RAM and cache at the problem as well as offering metering utilities and pay-as-you-use schemes might make sense. µ