I have:
1 Q6600 @ 3.825 running 5 normal clients producing around 4.6K PPD
Dad has:
1 Q6600 @ 3.400 running 4 normal clients
1 E8500 @ 3.500 running 2 normal clients
1 Duelcore AMD (not sure what) @ 3.000 running 2 normal clients
1 P4 Prescott @ 3.900ish running 2 normal clients
plus some older machines
I would recon that on a good week normal unit wise we are looking at around 12K PPD as FahMon shows PPD incorrectly on 3906/7.. will be interesting to see now everything is up and running
As of monday/tuesday will have E2180 @ 3-3.5ghz running 2 normals as well
TBH would probably get a little more from WINSMP clients...
but i had a load of issues setting up two on my machine.. were very unstable and 5 clients produces a comparable amount and is rock solid (I can run the rig @ 4.2ghz with 5 clients going

, not that I think its that good for it!) where as having multiple standard clients is easy to setup and takes little management.. and given that we are hitting 90%+ 3906/7 units I dont think there is much performance difference