PSU abbreviation used for Power Supply Unit is the main device which supplies power to all the components of the CPU. None of the components work without electric current
and this device helps in providing proper power to all the components in the CPU (motherboard, processor, GPU, HDD, etc).
This component is purchased on the basis of our requirements. Before buying this piece, remember to note down the wattage of all the components directly connected to this device and decide which one will be the best for you.
SMPS is a term used for Switch Mode Power Supply. SMPS and PSU are different from each other as, SMPS is the tech used in PSU and PSU is overall a dc output unit which converts normal A/C supply to 12 V or 5 V DC supply.
Power Supply Unit
PSUs and SMPS:-
Remember, TDP is not the total power consumption of any component. It is the heat released by the component. Hence check the total wattage of the part and note those figures down.