If you are new to PC power supplies, choosing one can be quite complicated. You only need one thing to power the others, right? How difficult could it be? But there are cheap ones, copper and gold, all with different gates. When choosing among the best power supplies for a PC, or PSU, your first question should be: what am I using this for, and what do I need? Since this is clearly a PC gaming site, we already have the answer to the first question. Choosing a PSU will come after you figure out which GPU and CPU you’re going to use.
For PSUs, the default is 80+ for most of what you’ll see. Therefore, a general rule of thumb is not to buy anything that doesn’t offer at least as much. But what does it mean? Well, that 80 refers to how efficient a power supply is at multiple loads. CPU and GPU both have certain power requirements. So under load, your PSU needs to be able to efficiently power both while running at minimal efficiency, in addition to everything else on your motherboard. But then there are the next ratings: copper, silver, gold, platinum and titanium, all of which are more efficient.
“More efficient” means exactly what it sounds like: PSUs consume less power. Efficiency in the most efficient PSUs is up to 90% at 20% load, and that means whatever load the PSU is at, you’ll always get at least 90% efficiency. The gold-rated PSU is only about 7% more efficient than the standard 80 at 20% load. But why bother with any of this? Two reasons! Computers obviously run many hours over the course of a year, so a more efficient power supply will save you money on electricity bills. Believe it or not, the money you save on your bill could actually be more than you spent on the PSU in the first place. Less efficient PSUs also generate more heat, which can be bad news for your PC over time. The hotter things get, the more your rig wears out.
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One extremely The important thing to keep in mind when choosing a PSU is the needs of your GPU. GPUs require a PCIE power cable connected to them from the PSU. Lately, a lot of GPUs require two 8 pin PCIE connection. If you try reusing an old PSU with a new GPU, you may find that yours don’t have the necessary cables and thus can’t get power into the GPU to even turn the damn thing on.
Therefore, when choosing a power source, consider it after you choose your GPU and CPU. See if it has the correct cable connection. Some PSUs have cables for the PCIE and CPU hardwired to them, while others allow you to plug them into the PSU. Things that aren’t modular PSUs take care of being hardwired, and you can pick and choose the type of cable you want to insert. Non-modular PSUs are hard-wired to the specified configurations. There is also a combination known as semi-modular, where some are rigidly wound (such as pcie cables) and some can be freely connected.
So in the end, what’s the problem? If you’re really trying to spend minimum, at least get something rated 80, but get something rated higher if you can, as it will last longer and lower your electricity bill yours a little bit. Then make sure and read exactly how many watts your CPU and GPU need. Then make sure it has the correct cable.
If you do all that, you probably won’t go wrong choosing a PSU. But don’t be surprised if you buy the cheapest you can find and it doesn’t work with your other components or just randomly dies one night, needing replacement. I have a relative who continues to buy junk power supplies and stock them up in case the one he’s using dies. You know, rather just buy a good one from EVGA or Corsair to start with. Don’t be like him. This is not complicated.
https://www.pcinvasion.com/pc-power-supplies-psu-what-matters/ What’s important in choosing the best PC power supply (or PSU)