You're welcome.
If he's doing intensive stuff it might be best to set the F@H usage to 90 or 95% - on my machine I don't notice any performance difference, but on the other hand F@H can slightly affect my family's machine with an Athlon 3200+, making it feel a little sluggish. Setting F@H to use 95% CPU cleared that right up.
Also, remember the client can be easily paused or stopped if he needs every last bit of performance. With the tray client it's just a click to pause, with the console client (which you can run invisibly as a service, if that appeals) it's easy to make a batch file which can pause, stop, resume etc folding - that's what I do.