I have received my devices, will plug them in after I get home from work.
EDIT:
I have connected them (used a brand new Corsair CX750 PSU for the two HEX8A1 miners) and they all work. I have replaced the 4 port hub with a 7 port hub (this one even has diodes so that the HEXB miners do not backfeed the power to the PC). However, one of the HEX8A1 has 5% HW errors:
cgminer version 3.12.3 - Started: [2014-03-07 18:15:15]
------------------------------------------------------------------------------------------
(5s):1.016T (avg):876.6Gh/s | A:181613 R:160 HW:17 WU:1999.8/m
ST: 4 SS: 0 NB: 1 LW: 208536 GF: 0 RF: 0
Connected to stratum.mining.eligius.st diff 512 with stratum as user xxxx
Block: 702b1b62... Diff:3.81G Started: [18:15:15] Best share: 6.58M
------------------------------------------------------------------------------------------
[P]ool management [S]ettings [D]isplay options [Q]uit
HEXb 0: 540 900/ 910mV | 47.16G/47.48Gh/s | A:12592 R:64 HW: 0/0.00% WU: 663.5/m
HEXb 1: 540 900/ 904mV | 42.62G/43.63Gh/s | A: 4320 R:64 HW: 0/0.00% WU: 609.5/m
HEXb 2: 540 900/ 900mV | 50.97G/47.54Gh/s | A: 9408 R:32 HW: 0/0.00% WU: 664.4/m
HEX8 0: 260 1000/ 946mV | 368.0G/232.6Gh/s | A:48431 R: 0 HW: 0/0.00% WU: 19.6/m
HEX8 1: 260 1000/1003mV | 466.6G/221.0Gh/s | A:46511 R: 0 HW:17/5.40% WU: 19.9/m
HEX8 2: 260 1000/1004mV | 461.7G/286.9Gh/s | A:60351 R: 0 HW: 0/0.00% WU: 23.8/m
------------------------------------------------------------------------------------------
[2014-03-07 18:29:36] Accepted 78a99991 Diff 543/512 HEX8 2
[2014-03-07 18:29:38] Accepted 02cde5ed Diff 23.4K/512 HEX8 0
[2014-03-07 18:29:40] Accepted 136d7087 Diff 3.37K/512 HEX8 2
[2014-03-07 18:29:42] Accepted 40d662b1 Diff 1.01K/512 HEX8 1
1. Is there a way to reduce the overclock on that particular device, while keeping it on the other two?
2. Do these devices report their temperature? If so, how can I see it?
But yea, the heatsink arrangement makes it difficult to place the miners so they do not blow hot air into one another or other miners...