Would you mind elaborating on this -- using a single 850 watt corsair PSU?
1. Are you doing both BTC & LTC mining with this PSU?
I am guessing he is mining only LTC. Using his computer to control the miners, he cannot turn off the BTC core. He said 55-60 A/C watts per miner. Assuming 80% efficiency of the PSU, that is around 48 watts to the Miner. The Miner will draw closer to 60 watts (75 A/C watts) while mining.
2. Can you tell me how you wired this up?
If using a stand alone PSU, on the 20/24 pin connector:
1) Optional: Put a high wattage resistor across a red (5 volts)and black (ground) wire. Pins 23 and 3 work well. This puts a 5 volt load and stabilizes the 12 volt rail.
2) Short pin 16 (green: power on signal) to a black wire (pin 19 works well). This turns the PSU on.
For all PSUs:
3) Take a drive connector. The yellow wire is 12 volts, and the black wire is ground. On the miner power cable, the Red Miner Wire connects to Yellow PSU wire, and the White Miner wire connects to the Black PSU wire.
Although the Drive wire connector is rated for 11 amps (130 watts), I wouldn't put more than 4 amps (50 watts) on a single wire. Although that would be all 10 miners in LTC only mode, to be safe, I wouldn't put more than 2 miners per Drive wire.