There is a new version cgminer available now, version 3.12.3. Works great with Antminer U1. Just run cgminer with these (extra) options:
--icarus-timing=short --anu-freq 250
Hashrate is around 2 GH/s, I use a standard 12V Fans for some extra cooling.
freq(hex) freq(mhz) ghash/s
0781 200.0 1.600
0801 212.5 1.700
0881 225.0 1.800
0901 237.5 1.900
0981 250.0 2.000
0A01 262.5 2.100
0A81 275.0 2.200
I tried using anu-freq values above 250 but got >50% HW error on all devices.
antminer u1 cgminer 3.12.3
The ANU 4 Antminer is my faulty one, don’t know why but this one has about 30 to 50% HW errors.
Some new gadgets, USB Antminer U1 SHA-256 Miner @ 1.6 to 2.6 GHS (with OC). These are not supported yet by the standard miningsoftware, used a modified cgminer, you can get it here: https://github.com/AntMiner/AntGen1. I put 5 Antminers in a Rosewill 10port Hub, put a 12x12cm Fan in front of it and fired it up. Tested some settings to get the best performance:
./cgminer --bmsc-options 115200:20 --bmsc-freq 0781 -o YOUR POOL URL -u WORKERNAME -p WORKER PASSWORD
with these setting you get stock hashrate of 1600MHs
./cgminer --bmsc-options 115200:20 --bmsc-freq 0881 -o YOUR POOL URL -u WORKERNAME -p WORKER PASSWORD
with these setting you get stock hashrate of 1600 to 1800MHs
./cgminer --bmsc-options 115200:20 --bmsc-freq 0981 -o YOUR POOL URL -u WORKERNAME -p WORKER PASSWORD
with these setting you get stock hashrate of 2000MHs. One strange thing with options 1 Antminer gets very much HW-error, the other 4 work fine.
Please be aware when you overclock them warranty will void (terms of us from the manufacturer) and you always should use proper cooling. The standard factory setting is bmsc-freq 0781.
Antminer -bmsc-freq 0971