ulfasoft i get 4mhash/s per core.. through this im getting 800khash-1600khash
One thing which could contribute a bit to the slower speeds: I deliberately set the thread priority to be the minimum. I wanted to make this so that you could run it all day, while you were actually using your computer (even gaming) and not notice that it was running.
The numbers I'm quoting from Ufasoft's miner are with the process priority set to "Below Normal".