Just for the sake of accuracy: the main intent of an active PFC in power supplies is to reduce the strong harmonic content of the power supply current consumption, which is quite different from reactive power. Power supplies draw a pulsed current waveform, with strong odd harmonics which degrade the voltage waveform in the AC mains. Active PFCs make this current draw close to a sinusoidal, removing most of the harmonic content. That said, it does reduce reactive power consumption, if present, as a welcome side effect.
Ah, sure (for the sake of pickiness): computers don't "generate" any form of power - they consume it.
Best regards,
Emerson
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