I don't know specifically about the CX750, but with most Corsair PSU's I have used this would not work. I know it's not advisable, but it just plain may not work at all. It seems if I load a PSU with multiple miners I need to be at least 10 -15% under the rated wattage or the PSU will just turn on and then off as if overloaded. Sometimes this is solvable by starting one device, letting it warm up, then adding the second. But there seem to be safety mechanisms to prevent you from pulling too much juice. I always try and be 100-200w under the PSU rating. Then I don't have issues. For what it's worth....
I've managed to run two overclocked S1's on a Corsair CX750M no problem although its not advisable. I've also had good luck with the corsair HX750, and the EVGA SuperNOVA 750G2.
I just hope I have the same result with the S3's. - Edit: When we eventually get to underclocking them.
Just make sure there is nothing flammable near by if you are going to do that long term. I have seen this go very bad.
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I am running 3 S1 on a 1200 watt PS Silverstone Tek ATX12V/EPS12V 1200Watts 80+ Gold
power to the wall is 1100 watts.
All of my S1 are over clocked to 400 giving me on average 200GH. I did add a second fan to every S1.
