Sweet! Another quad folding addict :biggrin:
What is the 6400 running? one of those cache intensive 2608/9's? linux or win smp?
If it is and it is running linux, you can try swapping it with a 2653 on the quad but if it is running win smp don't move it now since it will probably restart from 0%. There is some risk but if you make a backup copy of each wu before moving them you can always restore them the way they are now. It would probably gain a few hundred ppd overall.
With Fahmon, you can select the client and right click to 'view files' on each instace ... an easy way to open an explorer window to each client's share. I don't move wu's around much lately, but if i get 2 2609 on a single rig ... at least in native linux, it is best to run them one at a time or move one to another rig with 4mb cache. Haven't had to do it yet with vmware/linux and the impact might minimized by setting affinitiy on each vm so the 2 clients don't clash over the 2 4MB caches.