There is a modern design of old technologie available, these casings are best industry practice.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fwww.minerhome.com%2Fwp-content%2Fuploads%2F2018%2F09%2F%25E7%2594%25B5%25E5%25AE%25B9%25E5%25B0%258F1.png&t=663&c=CEDPKWeDfdb45Q)
Overall containing a dozen huge FPGA (not ASIC!) chips, 6 on a single Hash board.
Just from my (outdated) experience running ZTEX boards, those who closely assembled a Cairnsmore1 device:
They did not last for long, old devices usually featured 3 of 4 chips remaining and 1 dead chip which was not replaceable. Placing 6 on each Hash board requires perfect cooling conditions.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fwww.minerhome.com%2Fwp-content%2Fuploads%2F2018%2F09%2F%25E7%25AE%2597%25E5%258A%259B%25E6%259D%25BF%25E5%25B0%258F.png&t=663&c=EkVF7phn_-bf2Q)