Both of mine average around 36 GH over twelve hours on high clock mode
One thing I have to say, I was using BFGminer in proxy mode and only averaged around 30 GH on high clock.
My son suggested that I use the Slush proxy because he felt it performed better.
I did, and over the last several days I have averaged 5 GH more per cube.
Your experience might differ, but I suggest that anyone running bfgminer try running the cubes with the slush proxy and see what you get.
Here is my Eligius stats page. Look under worker details and see for yourself.
Cheers
Art
http://eligius.st/~wizkid057/newstats/userstats.php/1Mhdwbd88ZvVsuQezdCgiSXGs3CbAs3tAP