I just got me two ASUS ENGTX 560 Ti Top( on an ASUS Crosshair II Formula/Phenom II X4 940 BE)..
would try them on Einstein for a reference value, if it wasn´t for the heat.
The cards stay in a acceptable temperature range, but their heat kills my southbridge for my average room temperature is a little bit high (30-35°, and no chance for a proper cooling of the room...). Maby i should give water cooling a try.
At Primegrid they easily managed an astonishing output untill i turned them of during the day...
All in all i am very satisfied with their performance and the only thing i can think about is that the summer is already lasting too long ;).
mihi deliberandum est....