Windows 10: New to GPUs - GPU needs power - not sure how to plug 'er in

Quick question. I purchased a used graphics card on Ebay ('cause I'm cheap that way, and I really couldn't justify it anyway). At any rate, it's an MSI GTX 970 4GD5 OC. Enough with the details. It did not come with a power supply, so I dug through my cables and found a cable with 8-pins one end, and TWO PCI-E 6+2-pin connectors on the other. The GPU has two available 8-pin ports, so my question is this. Can I use this cable, or am I better off using two 6-pin cables, and plugging them into...

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having issues with multi GPU

I’m trying to offload certain apps to my iGPU on the second screen, using the new graphics settings in the recent win 10 release. the issue is it’s only showing my 1070. lists it as both power saving GPU, and
high performance GPU.

I’ve been fiddling for a while now with no joy, and i’m really hoping one of you guys has an idea they can suggest to sort this!

I can extend onto the second screen no probs with it plugged into the iGPU, but the 1070 is still listed as both power saving GPU and high performance GPU.

Are there requirements for this? certain level of iGPU for it to work?

Thanks

Edit - setting the secondary screen connected to the iGPU to be the "main" display in graphics settings makes my iGPU show as both power saving and high performance GPU, I just can't seem to get them
to be one and not the other.

 

GPU

Hi Michael

Open Device Manager (accessible by right clicking your Start Button)

Expand the Display Adapters section

You should see your GPU listed, along with possibly an integrated graphics option

If that is no listed there:

Boot into BIOS (start your system, then on the manufacturers screen, repeatedly press the appropriate key (usually F2) to enter BIOS

Under System Information, you should find your GPU listed

If you still cannot find the GPU listing, what is the Make and exact Model No. of your PC - that will be printed on a sticker on the bottom casing . ..

 

Is there a way to force a program to use a secondary GPU?

I have 2 GPU's (Nvidia GTX 970 and 1080) and I want to force a program to use the 1080 for certain programs/games. Going to Settings>System>Display>Graphics Settings should give me the option to switch GPU's. Unfortunately it does not list both of my GPU's
nor does it allow me to change to another one, only the default GPU is chosen (the 970). This is a desktop computer and I have tried the Nvidia control panel and UEFI settings without much luck. If I tried selecting a program to run on my 1080 (through the
Nvidia control panel), it would still run it on the 970. I have tried switching the GPU's around with not much luck there either. If I can suggest to Microsoft the option in the Graphics Settings to list both GPU's for selection, that would be great. Otherwise
I don't know what to do. Does anyone have any suggestions? Thank you for your time.