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resulting in most of the power requirement of a modern personal computer being on the +12 V rail. When high-powered GPUs were first introduced, typical ATX power supplies were "5 V-heavy", and could only supply 50-60% of their output in the form of 12 V power. Thus, GPU manufacturers, to ensure 200-250 W of 12 V power (peak load, CPU+GPU), recommended power supplies of 500-600 W or higher. More modern ATX power supplies can deliver almost all (typically 80-90%) of their total rated capacity in the form of +12 V

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