I have a rev3 with the extra fan on the bottom (some don't have this?).

Using the diagnostic feature, the default firmware averages something like 844Mh/s while the 862Mh/s firmware averages 880Mh/s indicated, it is closer to the 832 and 862 advertised values in the non-ideal situation of actual mining.  Ambient temp is 74F (~23C) measured with an IR temp gun.  No throttling detected and a max temp of something like 53C for the single.  I will check power consumption in a bit when I move it to my mining rig.

cgminer 2.4.1 shows an average around 30Mh/s improvement, but I haven't let it run long enough to get a good average reading.

http://i.imgur.com/F5X7L.png