Sorry I messed up the second photo which should be corrected now.
Running Freq 350 (which I believe is standard)
Using CX750M PSU
I have a Kill-a-watt inline meter that is getting me the wattage read out.
As of right now I don't have access to the get the GUI status screens shots, but will get them out there soon.
I have replied to 10 people in the last year about the 750CXm and usually the psu is just short of have enough to over come the 2 cable feed in.
I see the shot and as I though only 2 cables not four.
a good easy fix may be use freq 300 see if it shuts down.
The CX750M is borderline gear, the two pcie jacks will be pushing near 300 watts each 24/7/365
Some will work 3 weeks, 3 months ,6 months ,3 hours at freq 350 .
the cables and jacks are just close enough to being good enough to hide the fact that they are maxed at 600 watts.
if you look careful it has a 62.5 amp rating for the 1 12volt rail which is about a 726 watt rating .
So cables vary a bit build to build
psu's vary a bit build to build
s-5's vary a bit build to build
home 120 volt sockets vary from 110 to 122 volts and 240 volt sockets vary from 220 to 243 volts.
So in your case each thing is on the -2 or -5% side of spec then when you add it all up the psu gives up the ghost but slowly not fast.
I suggest down clock to freq 300 let us know if it works.
here is a way better psu to buy sale ends today
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438061notice 4 separate pcie jacks
I even think this one is better below
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438060notice 4 separate pcie jacks