Quick power #'s, measured with my best unit.. and the only one that will hit 500GH.
Corsair TX850 80plus bronze PSU - single S3:
218 mhz -- 450 GH -- 346 watt at the wall
225 mhz -- 480 GH -- 370 watt at the wall
237 mhz -- 500 GH -- 394 watt at the wall
My first order was 10, and here's an average over the last few hours:
miner01 501.87 GH/s 3404032 (99.91%) 3072 / 0 / 0 0:00:03
miner02 456.70 GH/s 3092736 (99.93%) 2304 / 0 / 0 0:00:03
miner03 422.43 GH/s 3056128 (99.88%) 3584 / 0 / 0 0:00:03
miner04 442.37 GH/s 3094016 (99.62%) 11648 / 0 / 0 0:00:03
miner05 423.99 GH/s 3081984 (99.87%) 4096 / 0 / 0 0:00:03
miner06 429.29 GH/s 3043328 (99.68%) 9728 / 0 / 0 0:00:03
miner07 430.22 GH/s 2934272 (99.64%) 10496 / 0 / 0 0:00:04
miner08 451.09 GH/s 3077632 (99.88%) 3584 / 0 / 0 0:00:04
miner09 441.12 GH/s 2973696 (99.51%) 14592 / 0 / 0 0:00:04
miner10 454.52 GH/s 3096832 (99.69%) 9728 / 0 / 0 0:00:04
Overall, kinda disappointed with the lack of overclocking. (Which was warned about due to a bad batch of DC-DC..) While I do have one fast unit, One of the units won't even run at the STOCK clocks without X'ing out at least 1-2 of the ASIC's, and most of them can't survive even bumping up to 225. At this stage 2 or 4 power connectors doesn't seem to matter at all. The 500GH unit is running on (2), and the 420-units won't go faster on (4). I'm running 3 S3's per 1300W power supply, so it's not a power issue.
Feeling a little deju'vu to KNC here.. First batch got bad dies, 400GH, second batch got fixes, 550GH.