http://i1330.photobucket.com/albums/w576/visdude/S3-1_zps11b8a00f.jpg
http://i1330.photobucket.com/albums/w576/visdude/S3-2_zps1f13d617.jpg
Each is powered by a Corsair CX500 (non-modular version) which seems to be fine. I first tried its modular sibling, the CX500M, but the single flat modular PCIe harness/cable got hot very quickly. So, I strongly suggest to not use a Corsair CX500M (modular) to power an S3.
As much as I like Corsair products, I think they dropped the ball on the CX500M. Instead of having 2 separate modular PCIe harnesses from the PSU, each with a single PCIe power connector like the CX500, the CX500M only has a single PCIe harness that cascades or splits into 2 PCIe power connectors. It's merely cosmetic (modular - less clutter) rather than functional. What were they thinking? But then again, Corsair most likely expected the CX500M to power a mATX or a Mini-ITX HTPC/Gaming platform with a single mid-range GPU that requires 2 PCIe power connectors and not an S3 in a 24/7 operation.
With an 80 Plus Bronze PSU (CX500), power draw at the wall (using Kill A Watt) ranges from 358W at 28C (82F) ambient room temperature to 365W at 35C (95F).
At an ambient room temperature of 35C (95F), the S3 temperature hovers around 45C (113F). I am not sure how accurate the temperature sensor in the S3 is but a 10C delta is excellent for an air-cooled device.
strange, I run S1 on CX500M at 275 mhz for more than a month and a half (slightly overclocked; ~400W) and it was OK with wires a bit warm, but not burning, although i had an extra fan providing more airflow around the miner-maybe this was the difference.