1 x 6+2 pin to 2 x 6-pin PCIe

[1405]

if a single 6-pin PCIe connector is safe up to 75W, and If a 6+2 pin PCIe connector is safe up to 150W...
Why is it not advisable to use an adapter that goes from the single 6+2 pin to 2 x 6-pin?
(150W = 75W + 75W)

 

[Iceman21]

Normally, if you psu doesnt have the necessary connectors, its not good enough to provide power to your hardware.
I think if you have enough Amps on 12V rail there shouldnt be a problem.
What is your psu and gpu?

 

[1405]

GTX 970.
PSU has a +12V rail rated at 35 amp/420W