MP 1,1-5,1 advices for EVGA geforce GTX 770 installation with mac pro 5.1 mid 2010

[Tiyom]

Hi,
I just bought an EVGA geforce GTX 770 graphics card that I want to install on my mac 5.1 mid-2010. I need advice on which pcie cables I should use, 2 mini 6pin to 8pin, 1 mini 6pin to 8pin, 1 mini 6pin to 8pin plus 1 mini 6pin to 6pin? Also, will I need an additional power supply?
Thanks!

 

[Tiyom]

I tried to see if the card is well recognized by the mac using only a mini 6pin to 6pin cable: everything seems ok, the boot screen appears, the boot procedure starts then the mac restarts indefinitely as expected because the card is underpowered

 

[esatamacmodular]

If there are 2 pcie 6 pin slots then you must power them both. It is possible that your internal PSU needs to be modified or have cable adapters added (check forum for others trying to do what you are doing/ Don't open PSU without professional advice). If you decide to add a second PSU instead, you MUST power the PCIe slot ((where the graphics card fits into computer)) AND the graphics card from the same secondary PSU. So, with a second PSU you would also need a 16x to 16x PCIe riser extension so that you can have a place to manually power the PCIe slot as apple does not have one on their motherboard. Hope that helps.

 

[Tiyom]

Thanks for your help, on the graphic card there is one 8pin and one 6pin, I have 2 mini 6pin on the motherboard

 

[KeesMacPro]

I've used the exact same model GTX770 for a few years , powered by 2 cables:
-mini 6pin to 8 pin
-mini 6pin to 6 pin
Powered from the LogicBoard headers.

Never had any issues.

Edit: it is very important to always connect all power connectors on the GPU.

 

[Tiyom]

thank you @KeesMacPro ! I am pleased to know that !