As indicated in the title, power supplies are optional for office towers, but with one exception.
For an office PC, if you buy the minimum (a motherboard, a processor, the RAM sticks, a simple graphics without PCI Express power required, only one hard drive and a CD / DVD drive), the basic supply (420 W) will be sufficient. This power supply comes with the case if it is not a gamer case.
If you want to mount a gamer PC, you will need to buy one because the case will be delivered without power.
To choose the power supply, there are several specifications to consider :
To calculate the minimum power required for choose your power supply, use the calculator "Recommended Power Supply Wattage Calculator" from Asus. As indicated on their website, it's recommended to choose a power supply that provided a slightly higher power than the power indicated by the calculator. Otherwise, your computer may shut down or restart during a consumption peak.
For office tower, a gamer cooler will be useless.
But for a gamer PC (therefore, with a good graphics card), a gamer cooler will be recommended for several reasons :
To choose a gamer cooler, there are several specifications to consider :
For Gamer tower with a single graphics card (mid-range), we recommend the "Noctua NH-U12S".
For office tower, this is optional. The only advantage would be "the silence".
If you want to buy additional fans to add and / or replace your tower, here are several specifications to consider :
When mounting a fan or cooler for the first time, buying a thermal paste is optional. The reason is simple : This thermal paste is included with the fan (or cooler) that you purchase.
That said, if you change the motherboard or the processor, you will probably buy some thermal paste because the old has dried and heat transfer will not be enough.
As always, there are different brands and models for the thermal paste, but some are better than others for these reasons:
The card reader is optional, but with the number of devices that use memory cards (smartphone, tablet, console, camera, ...), the card reader can be very handy.
Most card readers are similar, but here are some specifications to look for :
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