When building a PC it is easy to get overwhelmed by the sheer number of options available. Not only does every PC need several components that all must be compatible with each other, each component, whether it’s a case, a GPU, or a PSU, includes several possible options and it is often unclear which you should choose and why. For PSUs specifically you will see several different wattages, efficiency ratings, form factors, and other options that can make it rather difficult to determine what is right for your build.
Below, we have compiled a list of the 3 most important factors to consider when choosing a PSU for your build. Note that this list is not exhaustive and there may be other factors for you to take into consideration. However, for most builds, these three things will be the most important.
1. Wattage
Undoubtedly the most important step in selecting the right PSU is figuring out how much wattage you need. If your PC requires 1000 watts but you have a PSU that can only handle 600 watts, your PC won’t even turn on. Thus, after you have decided on a GPU, CPU, motherboard, RAM, and storage solution it is recommended you use a PSU calculator to get an estimate of how much wattage your PC will require.
From there, it is a matter of determining how much more wattage you want than what is recommended. Generally it is a good idea to go with a PSU that has an output around 100 to 150 watts higher than your estimated requirement, to be on the safe side. Cooler Master’s GX III Gold is a top-of-the-line PSU with a particularly broad range of wattages, from 650W to 1250W, capable of supporting a wide variety of builds.
2. Form Factor
In previous articles, we have described ATX and SFX PSUs, and the differences between the two. Determining which PSU form factor you need largely comes down to your selected case and overall preferences. If you are building a smaller form factor PC with something like a mini-ITX case, you will not be able to use an ATX PSU. If your case is particularly large and you want to use an SFX PSU, you will need to ensure that you have an adapter bracket and that the cables are long enough to reach each component. Units such as the V SFX Platinum come with an included ATX-compatible bracket.
Think first about what kind of PC you want and what size you want it to be. Then determine which PSU form factor, ATX or SFX, is most compatible with your case. Most commonly, builders go with an ATX PSU for an ATX case, or an SFX PSU for an ITX case. However, if you are unsure or simply want to keep your options open, go for an SFX PSU with an ATX-compatible bracket.
3. Efficiency
An inefficient PSU can cause serious problems for the long-term performance lifespan of your machine. The more inefficient a PSU is, the more power is wasted and the more excess heat is produced. Luckily, determining a PSU’s efficiency is made very easy by the standardized 80 Plus certification system. This system utilizes metals to indicate level of efficiency. The rating system is as follows, from least efficient to most efficient: 80 Plus, 80 Plus Bronze, 80 Plus Silver, 80 Plus Gold, 80 Plus Platinum, 80 Plus Titanium.
Ideally, you will be able to find a PSU for your build that has a Gold certification or higher. For example, Cooler Master’s V SFX Platinum is highly efficient, while the GX III Gold can achieve Titanium level efficiency at light loads despite its Gold certification.
Conclusion
As you can see, choosing a PSU isn’t so daunting as long as you keep these three important factors in mind. There are many options out there, but ultimately only a handful of them are compatible with your specific build. Check your build’s wattage requirements with Cooler Master’s handy PSU calculator, know your case’s form factor, and research each unit’s efficiency rating, and you will be well on your way to finding the PSU that is best for you.
For a look at Cooler Master’s own wide selection of PSUs, check out this link.
Think first about what kind of PC you want and what size you want it to be.Then determine which PSU form factor, ATX or SFX, is most compatible with your case. Most commonly, builders go with an ATX PSU for an ATX case, or an SFX PSU for an ITX
ITX
Mini-ITX is a 170 mm × 170 mm (6.7 in × 6.7 in) motherboard form factor developed by VIA Technologies in 2001.
It's impossible to give an exact recommendation without knowing specifically what hardware you're working with, but using a PSU Wattage Calculator, or determining the power draw of your different internal components and adding that together, can give insight into how many watts you need.
To determine the correct PSU for your PC build, you need to find the total power your PC requires, measured in watts. First, consider and calculate the power needs of your PC's components, including CPU, Motherboard, GPU, RAM, hard drives, and any other devices you plan to use.
Expert-Verified Answer. Voltage Levels as well as Form Factor are the two most crucial aspects to take into account when choosing a substitute supply of electricity for a desktop pc.
If you're trying to keep your build to a strict budget, and doubt you'll be adding anything new for a while, then 650W is technically all you need for an RTX 4070. If this sounds like you, then the CORSAIR RM650 sounds like what you need.
Overheating is a significant cause of component damage to your devices, but it's not the only sign of a weak or undersized power supply. Weak PSUs can also be detected through the sound of your device's fans working harder to combat overheating.
When it comes to power supplies, you'll want to make sure the form factor is compatible with your case. Generally, standard ATX power supplies are supported in most cases. However, some may require a smaller form factor such as SFX or SFX-L. Be sure to check the specifications of your case before making a decision.
The closest thing to a permanent solution is to use a dual-PSU ATX adapter cable or a dual-PSU Sync Starter. The adapter cable is simple a factory-made equivalent of bridging the right pins on the second PSU, but with the advantage of letting your motherboard control power-on and shutdown for both PSUs.
What power supply do I need? To determine the correct PSU, consider all the power requirements of your components. Combine the total wattage with some extra headroom, and choose a PSU with a wattage rating that exceeds the total power consumption to ensure stability and future upgrades.
When choosing a power supply that's right for you, the primary selection criteria are the input voltage, the output voltage, and the output power capacity.
Is 750 watts good for a power supply? Yes, a 750W power supply is good for most people, depending on the CPU and other components of the system you're running.
For the average PC, the easiest way is to use a power supply tester. You plug the power supply into the power supply tester, and it shows voltages. If the voltages displayed are not within a very narrow range, the power supply is not functioning correctly. The other way is to swap out the unit.
This means a 500W 80 Plus rated PSU would draw a maximum of 625W at 100% load. Because of the relatively low-cost premium and advantages they provide (discussed below), we do not recommend anything less than 80 Plus, so make sure to look for this logo when shopping for your next PSU.
To determine the correct PSU, consider all the power requirements of your components. Combine the total wattage with some extra headroom, and choose a PSU with a wattage rating that exceeds the total power consumption to ensure stability and future upgrades.
In old days 50% load was recommended. I've done a very quick research and got this info. - Corsair's RM x series PSU are most energy efficient at about 40% load. This is when they waste the least electricity.
Symptoms like unusual noises, excessive heat, and system instability can indicate overload. Regular maintenance, proper sizing, and upgrading your power supply are essential preventive measures for power supply overload protection.
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