On my systems according to my kill-a-watt and verified by my monthly bill on the smart grid I am on. It in all reality cost me under $1 to generate a btc. But that isnt the case on my earlier build or machines with non custom psus.
You know what, screw it. I get 94% + off of my meanwell psus. First, Cablesareus says they have 48v 360s? is that an error or will that go boom? I got mine off ebay, and they run 2 5830s each and only add around 1.8-2.1 amps at a time to the current load. That alongside a 80+ bronze or silver and Im crunching away easy. (have a build that is running off a $30 (after rebate) 650w 80+ Antec Earthwatts with 2 of the meanwells each costing $22 each. ($30+(2x22)=$72 and will run 6 5830s on a msi890 gd65 (not a gd70) happily. Invest on a thrird $22 meanwell and you have a $96 100% independently powered rig that while I have only seen the 650+2 360w meanwell config at a verified 6.9amps to run it all, i assume you would run around close to 8amps for all the cards to run off the meanwells.
Forgot one cost variable. You need to cut (or pull) the molexed adapter off the gpu 6pims and buy a medical grade (if your smart) tool replacement cable to hook it to the surge protector. Home depot, sale, $7.