Additional info from Official BITMINE CoinCraft series 28nm ASIC miners thread:
3. Are the hashing cards for Coincraft Rig and Coincraft Desk compatibile?
Good question, we should add it to the FAQ. Actually no, they are completely different designs:
the desk is cheaper and uses less chips running at higher power usages while the rig is more expensive, has an higher amount of chips and they're running cooler.What does it mean? My guess...
CoinCraft Desk: max 5 hashing cards, each card with 10 chips clocked in nominal mode of 20 GH/s
CoinCraft Rig: max 17 hashing cards, source of first 500 GH/s unknown, max 10 additional cards (according to specification) with 15 chips clocked in power save mode of 10 GH/s?, some slots for cards are still free?
So can we get 2 TH/s in turbo mode from 500 GH/s CoinCraft Rig? Probably not..
Will we upgrade to more then 1 TH/s in future?
CoinCraft Rig has better J/GH/s ratio-not so important with cheap electricity and short time of operation (5-7 months), is rack mountable, but GH/s/$ ratio is worse then CoinCraft Desk.