A personal computer is a rather complex electronic device. Everyone knows about this, but when it comes to choosing components for the system unit, for some reason they forget that all electronic components are very sensitive to power failures.
At best, remember only about AC power outages and buy an uninterruptible power supply (UPS). But in order to power the motherboard, processor, video card, hard drive and all other PC components, the voltage from the UPS output must be converted. And the reliability of the entire device depends on the quality of this transformation. This is exactly what the power supply solves.
Do I need to pay attention to such a "trifle"?
Usually the field service technician work in the given site by the client, engaged in fixing and sustaining the network, hardware, software, and other telecom and IT-related set-ups.
Unfortunately, many users follow the principle: if only it works. And, as a rule, this approach leads to the loss of money and data.
The fact is that you need to choose a power supply based on the overall configuration of the computer, as well as the upgrade prospects .
The main parameters that affect the choice:
1) Computer configuration
The most difficult moment. It is clear that the power of the power supply must be greater than the power of all consumers. But it is rather difficult to calculate it, moreover, it depends on the programs being executed at the moment.
It would seem that we are choosing a power supply unit with a large margin, and there are no problems. But at an incomplete load, the efficiency of the power supply decreases and a significant part of the energy will simply heat the room. If the power is not enough, then the voltage at the output of the power supply will "sink", which will lead to shutdown or reboots of the computer.
Ideally, you need to see the maximum power consumption of all components, but you can focus on the following figures. For an office PC (integrated graphics card and entry-level processor), a 350W PSU is suitable. If you want to install a middle-class video card - at least 400. Two video cards (SLI) and a powerful 4-core processor - at least 600 W, and if you plan to overclock, then you should take a closer look at models with a capacity of about a kilowatt. Today, there are quite a few such models, for example, the OCZ Z Series 850 W power supply.
2) Connectors for connecting devices
For most power supply models, the set of connectors is the same, but you need to pay attention to the connectors for additional power supply of video cards (they are not available on all) and, if you plan to use a RAID array, on the number of connectors for powering hard drives.
3) Cooling system
In most cases, an active one is used - radiators plus a cooler. It is desirable that the cooler be of a large diameter and operate at low rpm, in this case the noise level will be minimal.
There are models with a passive cooling system (radiators only), but, as a rule, these are exclusive solutions.
A good power supply from a well-known manufacturer will not be cheap. But the price is quite dependent on the power. Therefore, before buying expensive components, just think: “Do you have enough money for the appropriate power supply?” After all, you do not want to risk an expensive processor or video card?