does mobo extreme4 auto pch voltage

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   As Parsec stated, the GPU's power is controlled by the GPU's own power systems. Most, if not all, GPUs have a similar power delivery system to a motherboard, in fact the GTX 960 I have is powered by a 12 phase power design that is actually more robust than the power system on my motherboard. 
If you are looking to get more voltage into your GPU (the actual graphics processor on the card) you will need to use a modded vBIOS (BIOS for your GPU) to achieve this. I would however strongly advise against it. If you were not aware of this then you most likely are not experienced enough to safely do so. Tampering with the maximum voltage of a GPU can instantly fry your card if done improperly. If you do choose to go this route and don't mind a little bit of a learning curve then you should be able to find all the information you need via google. Look up "volt modding" and your particular GPU (make and model). You should find pre-modded BIOS files for your GPU that have been tested as well as instructions as to how to flash to them and use them. Again, I do not recommend it as it most often offers little to no benefit and will drastically shorten the lifespan of your GPU if not blow it outright. 