Because of buck overheads and other things, the low-end hashing efficiency of the 2-chip BM1384 would only be at best a marginal improvement over the existing Compac. However, overclocking is where it'll really shine. The old stick's 5W performance was around 12GH, where 15GH is hopefully a conservative estimate for this one; 7W should see over 20GH instead of 16GH and the top-end 10W would get you about 27GH instead of the old stick's maybe hitting 20GH if it didn't burst into flames. Cooling should also be better because of the reduced heat density of two chips.
The pod, as it's laid out so far, is about a 5" square. I'm making both versions with the same formfactor for convenience, if someone wants to make enclosures or stack 'em into towers or whatever. The same hardware should work for any of 'em.
Heard a bit from VH earlier, he's making progress on the 1384 code. I'll be at the shop tomorrow doing some more testing and getting him some more info, but it's looking really promising so far. Code's a bit behind schedule but it was an optimistic schedule anyway, and I gotta take the blame for a lot of it for not getting hardware setups and some necessary testing done in a timely manner. Course there's also approximately zero documentation so that doesn't help. But if good news keeps coming to me at pace, I might have some good news for y'all in about a week.