To provide power to our PCs we need a Power supply. If any power supply consumes 500W that doesn't mean it actually consumes actually 500W from the socket, it may consume 550W, 600W, or even more than 700W.
The less power consumption from the socket more the efficient PSU is.
Any good quality PSU rated as 80+. Which indicated the PSU provided efficiency by more than 80%. If any PSU is 80+ Bronz then its peak Efficiency is 85%, If PSU is 80+ Platinum then the peak efficiency is around 94%.
In the case of generic power supply, we don't have any idea how much efficiency they provide, 60%, 50%, or less.
Even if you don't care about efficiency, there are still some major points to consider.
Expensive power supplies are not expensive because of their Efficiency ratios, they are expensive because the components used in that PSUs are high quality.
80+ rated power supplies indicate good quality components used in PSU.
Generic PSUs don't even come with protection like Over voltage protection, surge protection, circuit breaker, etc.
As those PSUs don't know what temperature and voltage are going on because of a lack of sensors and programmed ICs they won't protect you against over-voltage issues. as a result it damages your PC components.
To protect your PC components and to be on the safe side it is better to use an 80+ Power supply.
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