Rothhaus

Yeah I tried another cable, and what I meant with the 14 days was the right of return or whatever its called, you can buy something test it for 14 days and return it if you dont like it, I still have 2 years warranty.

Gets complicated.  The traditional use for push pull is noise reduction (which is kind of counter intuitive because you’re doubling the amount of spinning motors and blades). The deal is the fan speed vs noise production graph is not quite  flat. There’s a hook at the bottom.  If (and only if) you have a fan and cooler where the fan runs slowly enough to be very near the hook but not in it, the 20% boost of a second fan can  reduce fan speed enough to put both fans inside the hook making less total noise even though there are twice the fans.  If the second fan DOESNT put both fans inside the hook you just get more noise though.
 
There may be another situation regarding static pressure and radiators.  I know less about that though.  

Just make sure not to mess up which side of the fan air is pushed from. You don't want a Push Push config or a Pull Pull.
The size of the rad doesn't matter either, as long as it has the holes for fans on both sides.

They are different on the OTHER end (same on PSU end), so make sure to use the correct Y split cables.
 
Not all power supplies are the same, but for this model the PSU 8 pins are the same.

I'm on a gtx 970 now and I would like to upgrade, but how do you know that there will come new cards next year? Wouldnt that be a bit odd since they just released the RTX cards?