My PowerTower Pro 200 (w/7.6.1) gives me a consistent 1080 kk/s.
After a little prefs modification that takes away from general performance
just a wee bit, I still get netween 900 and 1040 kk/s on average when in
the background.
When all unnecessary extensions are removed the difference is only 5 to 10
kk/s better.
Todd Harris