When I checked GPU-Z today, it says that the board power limit for my graphics card was 37 watts (I have an AMD Radeon HD 8570 (OEM)) but I'm not sure as to whether this is the maximum power provided by my motherboard's PCI-E slot and if the motherboard will not allow a power supply with an 8-pin connector to work with the graphics card.
Adding a 650W PSU has no bearing on the motherboard. Just keep it to the dimensions shown.
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