I have a U3 miner. I get a consistent 73gh/s out of it. I use a barrel connector wired to a molex 4 pin into a standard atx psu. Biggest difference is heavier wire to the plug. I am running cgminer 4.6.1 using the following line: cgminer.exe --bmsc-options 115200:0.5 -o stratum+tcp://yourpool -u workername -p password --bmsc-freq 0B82 --bmsc-voltage 0800 I can actually get it to run higher than this and stable but the gh/watt ratio is bad so i don't.
if it matters. It is hooked to a Windows 7 64bit system via a usb 2.0 port. Oh, I did throw away the garbage usb cable I got with it and opted for a better quality one I had on hand too.
In response to be asked about a donation addy. I do not want donations. This was posted simply because i too had trouble and found something that works. If it works for you just enjoy your hash.