Overclocking Antminer U2 (USB)

[somatic]

I just got my Antminer USBs and they run at 1.6gh/s on default settings. They're intended to run at 2.0gh/s, so I'm trying to overclock them, but oddly, trying to overclock actually slows them down to around 200-400mh/s.

I'm using the custom version of cgminer here, like so:

Code:

cgminer.exe -o server -u username -p password

That gives me 1.6gh/s. But if I try to overclock like so:

Code:

cgminer.exe --bmsc-options 115200:20 -o server -u user -p password --bmsc-freq 0981

instead of going up to 2.0gh/s, I get the weird behavior where it slows way down. Any ideas?

I may break down and try bfgminer or something instead, but cgminer has always worked well for me and I'd like to stick with it if possible.

[kabopar]

Check if you are not going over your power limit - how many U2's are you using per hub? What is the current spec of your power supply?

I've been using these with bfgminer, where the instruction that worked for me to overclock to about 2 GH/sec per device is
--set-device antminer:clock=x0981

Note that Bfgminer uses the silabs VCP DRIVERS. Not the WinUSB driver installed with Zadig. To fix go to device manager with it plugged in right click choose driver settings make sure the checkbox for delete driver is ticked.  Download and install the silabs VCP drivers instead.

If you want to stick with cgminer, check out https://bitcointalk.org/index.php?topic=658668.0 where ckolivas addresses this.

Cheers

[somatic]

I broke down and switched to bfgminer, and that indeed did the trick. Thanks for the reply 

[kabopar]

Enjoy

[-ck]

That wasn't the official cgminer you were using since --bmsc-options and --bmsc-freq aren't part of cgminer proper.

[xjack]

OP - official cgminer supports these with switch --anu-freq 250

[leechenlua]

I'm afraid it is not effective
calculator on http://www.bitcoinx.com/profit/
shows that with 2.2Gh/s  a month just to earn 1$
I'm new, you can give me more