PSU
“PSU” is short for Power Supply Unit or computer power supply.
The PSU is the part responsible for powering absolutely everything from the GPU to the indicator lights that tell you that your HDD is full.
PSU performance
Performance is its first parameter. The nominal power of the PSU (for example 650W) is the ceiling for the power consumption of all components. The PSU has the task of transforming the voltage from the mains into individual voltages, namely 12V+ for the GPU, 12V- for the chipset, 5V+ for peripherals, 3V+ for the CPU. The power of the PSU is divided between the individual voltage branches and sized for a certain current load, which is always written on the side of the PSU. Thanks to this, you will get an idea of whether you really need a regular 750W power supply or whether you will only need a 600W Gold85+
Here we come to the second parameter and that is efficiency. Efficiency is a general designation for the ratio between input and output energy calculated in %. Here we will have to remind ourselves of elementary mathematics..
If you have a power supply with a nominal power of 800Watt marked as Silver80 and you load it at full capacity, how much will it draw from the socket? Simply 1000Watt. Because with an efficiency of 80% of the input energy from the 1000Watt network at full power, the power that your PC can use is 800Watt
If you have a power source with a nominal power of 800Watt marked as Silver80 and you load it at full capacity, how much will it draw from the socket? Simply 940Watt. Because at an efficiency of 85% of the input energy from the 1000Watt network at full power, the maximum power that your PC can use is 800Watt
If you have a source with a nominal power of 800Watt marked as Platinum (90) and you load it at full capacity, how much will it draw from the socket? Simply 890Watt. Because at an efficiency of 90% of the input energy from the 890Watt network at full power, the maximum power that your PC can use is 800Watt... So 150Watt less than the Silver80
So now we understand what the numbers mean and how to get them right for your lineup. But that's the last thing left to solve. It is important to choose whether you prefer long-term low consumption for a higher purchase price... Or you take the stronger Silver80 for a low price but slightly more expensive operation in the long term... So it is more about your own preferences, your favorite brand or ITX, ATX, FLAT type design etc.. However, thanks to the extreme difference in prices, today you will get practically the same price in 2 years..