The 400SC was a really nice box. We just retired one a few months ago. We also have a 420SC, 430SC and a 440SC. Out of the 4 boxes, I would vote for the 420 as the best. I just reloaded it with Server 2003, use it as a DC/GC and the Quickbooks workstation. Here is a somewhat i
nteresting site with a lot of info on the older SC's. Obviously not much activity these days but perhaps a decent resource. Too bad Dell never thought ahead and built them for more than 4 GB of ram.