Price updated. Free ATX breakout board with each 10 units purchased through Sunday.
I recommend switching back to the custom 4.3.3 build of cgminer if you are having issues with cgminer 4.4.0 or bfgminer 4.2.0. Both official builds are having reported issues reliably detecting the RBOX.
Also, if you are using the ATX breakout board, you'll note that the 8 pin PCIE connectors are actually 8 pin CPU connectors. You will be able to connect 6 of 8 pins, and that's all you need. I have ten running on one breakout board with no issues. Do not try plugging a cpu connector into the pcie connectors, as the polarity is reversed and may damage the board.
The breakout boards have BOTH 8pin CPU and 8pin PCIE headers...
The 8pin CPU connector (header) is the white colored, VERTICAL connector directly next to the 20+4pin ATX connector (header).
The black, horizontal 8pin connectors (headers) are the PCIE connectors and will accept 6pin OR 8pin without issues.
DO NOT PLUG MORE THAN 1 PSU INTO THESE BOARDS! Bad things happen.
I currently have my breakout boards supplying power using just the 20+4pin ATX and the 8pin CPU headers. I am powering 7x R-Box units between 2 breakout boards (5 on one, 2 on the other). The breakout boards also serve as a power switch for the PSU supplying power, in my case, the PSU is also supplying power to part of my S1 farm.