Run it at "Low" speed. If that works, and you get failures at "High" speed, then you need to crank up the voltage.
I have two Blades, one is perfectly stable at 1.15v, the other isn't so much and will need a bit more. The second one intermittently reboots, and some of the chips X out.
I'm running mine off a Corsair CX750 - I was using an older Zalman 1000W unit before which didn't seem to like running with no 5v/3.3v load. The new Corsair runs perfectly.
how did you hook it up to the blade? I have the same psu, did you need an adapter or did you strip the wires and use a molex adapter? I'm confused by this guide lol :[