Looks like a longer tube. How did they get the efficiency up?
Downclock and downvolt each chip.
Nope. Its a new parallel powering layout which is simply more efficient. If I get a Prisma you'll be able to see it in the pictures.
That may be true but it's also underclocked. The tubes were 8.3gh/s per chip and Prisma is 7.3gh/s.
Where did you hear about this "parallel powering layout"?
Downclocking the chips by 10% doesn't result in 25% power savings. The design was first done by XBTec on their Pacifics (
https://farm4.staticflickr.com/3874/14825302026_f8e55aca1f_o.jpg) which results in significantly lower power requirements by stringing the chips together. [Note their V1 didn't actually realise the power savings in the design due to other bottlenecks, but the V2 did]. This is the same 'technology' that friedcat has put on the Prisma to generate the power savings compared to the Tube.
