I've heard some mixed answers to that. The smp client is supposed to put all the cores to work, but when I use one smp client, it shows my cpu usage at %50. The explanations to this went over my head, the jist of it was that the windows clients are inefficient, works better on linux. Running a second smp client takes my cpu usage up to %100, but I don't know if the performance suffers or not, haven't taken note of the differences yet. Maybe I'll do a little comparison once I get them up and running. Like I said in the other forum post, work servers seem to be on the fritz now. Both of my smp clients lost connection, GPU is still going strong, though.