I am installing an NVIDIA GTX 1070 in a 2009 Mac Pro. I have seen all kinds of cables selling on Amazon and eBay to power GPUs in a Mac Pro so I want to make sure I get the right one.

Looking at the NVIDIA GTX 1070 manual, it looks like I will need an 8 pin connector on the graphics card side:

enter image description here

But there are cables that have this 8 pin connector with either one or two 6 pin connectors that will connect to the Mac Pro main board.

The cable I ended up ordering has 2 x 6 pins and 1 x 8 pin connectors:


Will this cable properly power the GPU and should I connect both 6 pin connectors?

1 Answer 1


You will need a Y cable with 2 x male mini 6 pins at one end and 1 x male 8 pin on the other end.

You will have to connect both mini 6 pin ends to the motherboard. 1 x 6 pin will not provide enough power. Only both 6 pin ends will be able to provide the power your GPU needs under full stress.

  • Thanks for the answer. The cable you describe sounds like the one I ordered. Commented Sep 23, 2018 at 21:42

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .