Butterfly labs is showing off it's final iteration of the 50GH mining board and chipset. The current photo is showing 52GH at 76C.
It appears that the power consumption issues have been reduced. Power consumption was 350W and now appears to be 250W.
"29 May 2013 - ASIC Update
Almost there... I'm attaching a picture of our test board. We've almost got the firmware finalized, as you can see, we've brought power usage down quite a bit. This is a 50 GH/s unit with unbinned chips (meaning the chips were randomly selected, so some of the chips have non-functional engines. What this means is the unit can perform faster if you use binned chips with known good engines).
I think the picture speaks for itself, and I apologize for the quality... just took a quick snap while we were working. However, you can see that our power usage is under 5w/GH/s. This should apply across all product lines. I plan on testing out the short boards tomorrow. We should be getting in many of the reworked short boards tomorrow as well as some long boards. Next week, we expect a much larger shipment of both long and short boards to arrive (possibly even this Saturday, but that's still up in the air.)
In any event, we should have the firmware finalized by tomorrow night or Friday at the latest and ready to go."