Yes, three out of four are smp(2x2.0GHz, 2x2.4GHz, 2x2.4GHz) and the performance is very good if they are fully loaded with ram. So make sure that you have as much as possible, as that can impact performance quite a bit. I have found that running the disk in 1+0 mode gives the best performance, but I have no figures to back that up.