http://en.wikipedia.org/wiki/Molex_connector"There are three typical pin sizes: 1.57 mm (0.062 in), 2.36 mm (0.093 in), and 2.13 mm (0.084 in). The 1.57 mm pin can carry 5 A of current, while the 2.36 mm can carry 8.5 A. Because the pins have a large contact surface area and fit tightly, these connectors are typically used for power."
These blades require 10A and thus even the meatiest molex can not power them. Please get these wired up properly people, before someone starts a fire :/
Edit: attempt to be more helpful:
There's a dozen posts telling you how to wire these up but there's really only a couple of things you need to get right in my opinion.
1 - don't exceed the amps that the PSU rail can supply. I was powering four of these puppies off a 750W Corsair that could supply 62A on one rail for a week without a single issue. Single rail PSU guarantees that every yellow wire coming out of that box is backed up by 62A (though that doesn't mean that one WIRE can supply 62A)
2 - chop off all the plugs and just wire the yellows and blacks straight from the PSU into the blade connector. This removes points of failure and eliminates any weak points (generally, the plugs are the weak points). I had mine wired up using 2x18AWG cores. That is two yellows, and two blacks, each 18AWG, into each blade. I chopped off the PCI-e connectors to do this.
Over short runs, 18AWG should do 16A (apparently) and by running two cables to each blade I'm only asking each pair to do 5A - well within my comfortable margin. And no connectors to worry about!
Disclaimer: not an electrician but my 4 blades ran just fine and didn't melt anything by doing the above (moved them on now but as far as I'm aware they're still fine).
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Been waiting 2 hours now for one of mine to even show up in blockchain.info :/
