Laptop Mobile GPU Power consumption?

So I am building my own laptop and my goal is to give it as much desktop performance as possible. Cooling is not a problem since I have already design

So I am building my own laptop and my goal is to give it as much desktop performance as possible. Cooling is not a problem since I have already designed a very potent cooling system.

My question is, where do high-end mobile graphics cards like a Ge Force 980M get their power from?
I did quite a lot of research and what I found was that there are three tiers of MXM slots used in laptops. But even the "high-end" slot MXM-III only provides a maximum of 35 watts to the GPU. When I when to look at the GTX 980M's power draw i found that it had a TDP of 122 watts which is not a completely accurate way to measure power draw but shows that the power draw of the GPU is well over 35 watts.

So where do mobile GPU's get their power from?

or:So I am building my own laptop and my goal is to give it as much desktop performance as possible. Cooling is not a problem since I have already designed a very potent cooling system. My question is, where do high-end mobile graphics cards like a Ge Force 980M get their power from? I did quite a lot of research and what I found was that there are three tiers of MXM slots used in laptops. But even the \"high-end\" slot MXM-III only provides a maximum of 35 watts to the GPU. When I when to look at the GTX 980M's power draw i found that it had a TDP of 122 watts which is not a completely accurate way to measure power draw but shows that the power draw of the GPU is well over 35 watts.So where do mobile GPU's get their power from?

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