HashFast clarified it won't be bare chips. It will be processing boards. I believe the OEM water cooling unit HashFast is using is also available retail from Corsair. Any CPU waterblock should be compatible if one wants to build a custom system. The boards connect by USB so any embedded system (rPi, Beagle Board) or entry level PC can be used as a host. Power is by 6 pin PCIe connectors so any good quality PSU should be fine.
thanks for clarifying... I thought this was changed but when I went back to the site it wasn't changed there (under the FAQ and other locations)