I know Bert says the T410 at least, but I'd say either get the Dell T110 (designed for Single OS Server) or skip over to the T620 (designed for Virtualization/Terminal Server). The T310, T410, and T610 are all built using last generation hardware, socket LGA 1366. While The T110 has LGA 1155 (aka SandyBridge) and the T620 has LGA 2011 (aka IvyBridge), which are both this generation. It's been shown in an overwhelming number of benchmarks that the LGA 1155 processors outperform almost all of the LGA1366 processors with the exception of the $1200+ ones. It's like the i7-2600 vs the i7-920 (in desktop terms).

Sandeep Luthra | LTMedical.net
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