So, has anyone with these btmine units actually gone up to 1600 MHz? I saw it was mentioned earlier, but I'm not sure it wasn't just suppostion, especially with other similar clones only running 1250 or 1300 MHz. Right now I'm happy with 1500 MHz running solid for 2 days straight. No high error rates or temps. But, if I'm throwing perfectly usable cycles on the floor, well, I'd rather not - comes from my SETI/BOINC/Prime days... 
1600 OC stable but HW rate goes up to 10% and 1028w from wall.
1500 OC is the sweet spot 961w from wall. Under 4% HW error and hashrate stays around 230GH/s
I think it's very important to have good power supply. You will also save easy 100w electricity with it.
2x Stock PSU @1400 = 946w from wall. @210 GH/s
-edit- Stock PSU settles to 999w after 1 hour
2x Stock PSU @1500 = 1060w from wall and they will blow out at some point dont wanna try.
2x 1kw PSU @1500 = 961w from wall. @230 GH/s
2x 1kw PSU @1600 = 1028w from wall. @+230 GH/s 10% HW errors not worth it.
For those who dont know PSU will perform better when not tortured full. So you will save 100-150w Electricity by getting good PSUs
NEXT coming from Sikke: Watercooling 101
(i have watercooled CPUs from 1999. i put AMD Duron 700 --> 900Mhz)
That did the trick. But isnt this dangerous ? No overheat protection ? I have temp1 at 21° where does that come from as i have only one sensor...
This is for you. You can get the unit very silent
simple to install. Temp sensor still works as safety backup for overheating. 70c @ cgminer will shut down.http://www.aliexpress.com/item/water-cooling-kits-for-Avalon-II-BTC-miner-BTC-38Gh-s-miner-BTC-mining-machine-BTC/1562933976.html
http://www.aliexpress.com/item/water-cooling-kits-for-Avalon-II-BTC-miner-BTC-200Gh-s-miner-BTC-mining-machine-BTC/1578317468.html