At 164/152/146 = 232MH/s we were getting 0.5% errors, so we downclocked to 162/150/146 = 230MH/s and let it run overnight -- 0% errors.  Here's the hashrate measured at Eligius: 225MH/s of shares and 2% stales is exactly 230MH/s.  We're working on improving the stales to something more like 1%.  Power consumption is 10.68W at the 12V input meaning efficiency is 21.17MH/J.