So I did what any crazy person would do and bought me another Monarch on wednesday. This time it was a regular auction on ebay. 230 pounds / 290 euros, so a tad cheaper than my first "550GH" unit.
The board seems to be a different revision. It's a "700 GH" model with a mini-usb connector (which the 550 GH model didn't have) next to the pci-e power connectors.
http://i.imgur.com/Itspqdq.jpgThe problem is that it's running too hot, above 80 C and the board starts throttling after only a few minutes of running. Power draw is 570 watts from the wall at 800 GH/s.
So it would be great to have a method to underclock this thing as I don't really need the extra GH/s with a bigger power draw and overheating.
By the way, Raspberry Pi with Raspbian OS and cgminer 4.6.1 seems to run two Monarchs just fine. CPU load is ~0.40.
