Compatibility of servers with video cards. Where can I get extra power for the gpu?

Question

Server equipment

Hello. Recently I was interested in buying a grid, tesla or firepro.
I looked at the photo and saw that they also require 6-8 pin additional power.
Since there was no practice with gpu servers, I decided to ask. Where to power it from or how to determine compatibility with gpu by servers? Google only shows ready-made server assemblies with maps, so it's not clear in this case how to "not collective farm" but to find the right solution. Thank you.

Dell poweredge r430 and r720

Answer 1

The question is closed. Since the server power supply (both power supplies were 1.2 kilowatts) I took power from them. I have not tried vGPU before, so I asked. For further questions about "How to connect a card on the server" - We look at the devouring of the GPU + other resources, I looked through the counter and counted the VA blocks.
Tesla took power from the processor power supply through a twin. Thanks everyone.

Answer 2

Maybe to begin with, indicate the characteristics of what is?