Because im running a quad can you run 2 SMP's? thought i read that somewhere...
edit - also running the one SMP my cpu usage is only at about 25 to 30 percent. is that normal?
To answer your question about CPU usage, it should be at 100%. Did you add -smp in the extra parameters field during the config? You can also add -smp at the end of the target with a space in the properties window in the target field, after a space. Make sure, if you close the client to restart it, that you close it by bringing the FAH window to the front, and hold CTRL and press "C" to avoid corruption to the files.
As far as having 2 SMP clients running, I do think it can be done, as long as you use separate machine ID's. The thing is, I don't know for sure that it will net you any more PPD. If anything, I would think that running just one client will net you the best PPD, where with 2, they each would be running at a slower pace. The reason some of us use VM's with Linux, is because the Linux clients do net a higher PPD, and VMWare server only allows us to use 2 cores. I would really suggest using just one client, and if you have a capable GPU, we can also help you set up the GPU2 client which can get you quite a bit more PPD.