It would be great if somebody there could help me understand if there is any difference between a par of matched Intel E5472 SLANR processors that were installed in a Mac Pro early 2008 and say Dell server. I would like to upgrade my single processor Mac Pro to two processors and have an opportunity to buy a pair of matched E5472 SLANRs that came from Dell. On a gut level I would expect to be no difference, but that's just gut and not brains. Cheers, Paul