Any GPU that does not require additional 6 or 8 pin power cables and instead draws all its power from the PCIE lanes basically can not use more than about 75watts as that is all the power that the PCIE slot can supply.
Even though said cards can't physically draw more than 75 watts of power you'll often see the manufacturers suggest much higher wattage PSUs as the recommended wattage you see manufacturers list for GPUs is usually grossly over inflated just to cover their asses in case people have very bad quality GPUs or some very odd setup that draws a lot of power else where.
The two large power draws in a PC are the CPU and GPU.
Most CPUs draw somewhere between 35w and 125w max and with that 75w GPU you really shouldn't every hit more that 200w at full load and that is worse case scenario.
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