I'm trying to mine with the same card and only getting less than 11.50 Khash/s
This is way too few because the google doc file says I should be getting 178!
https://docs.google.com/spreadsheet/ccc?key=0AjMqJzI7_dCvdG9fZFN1Vjd0WkFOZmtlejltd0JXbmc#gid=0
line 76