I know that this might not seem important, but choosing a computer power supply is extremely important for your computer build.
My brother didn’t know what he was doing when he built his first computer and got a power supply that was undersized. He ended up frying everything.
Messing this up can be a very costly mistake. This is one of those places where you don’t want to go cheap. But sometimes you can find a steal of a deal if you look around.
Every item on your computer uses electricity. I know you can call me Captain obvious now, but your power supply can only provide a finite amount of electricity.
In your house when you pull too much electricity your breaker will trip. In your computer there isn’t a breaker. If your computer pulls more than the power supply can provide, then you start to fry stuff.
The best thing to do to prevent this kind of catastrophe is to calculate how much power everything is going to pull, and double it. This will get you in a safe spot in case you forgot something or you decide to upgrade later down the road.
If you have a power supply that is rated much higher than what you actually need, then you computer just doesn’t pull Everything it can. For example, if your power supply is 1000w but your computer is only using 400w then you aren’t wasting 600 w. It just isn’t using it.
You don’t need to know how much electricity each part of your computer is going to use. Somebody else has already figured that out and had put together calculators. One of the ones I’ve used before can be found here.
When you use the calculator, it’ll give you a recommendation on how much you should
Bronze, Silver, Gold, and now Platinum
When you are looking at different power supplies you’ll notice that that some of them are bronze, silver, or gold certified.
This certification relates to how efficient the power supply is. When dealing with electricity, there are always heat losses. If you’ve ever touched an old incandescent light bulb you’ll know how much heat can be given off.
In a computer, heat is our enemy. If you can do something to produce less great it’s a pretty good idea to do it. Each of the different certifications is approximately 2% more efficient than the one before it.
They might save you money on your electric bill, but they’ll cost more out of pocket. There is a balance between between how much you pay now, and how much you’ll save on your electric bill.
When we did the power calculation I recommend that your power supply is able to produce twice as much power as you needed. Now you know why I recommended you to double it rather than just do a little better. You’ll acheive the best energy efficiency with 50% usage.
Cabels vs. Modular
Some power supplies are modular. All this means is that you can pick how many cables you plug into it. Like the one shown here.
If you get a non-modular power supply, then you’ll have to deal with storing the unused cables somewhere in your case.
This might not seem too terrible, but remember how I said heat was the enemy? Your case had fans on it to wake war against the heat generation. Cables are obstacles that block the cooling effects of the fans.
Some cables are simply necessary, and you’ll eventually need to figure out a way to deal with them… This means zip ties and a lot of them.
Cables that aren’t needed are just going to take up space and block your air flow. In my opinion getting a modular power supply is a much better approach.
Other Things to Consider
These are things that you probably aren’t going to need to worry about on your first power supply purchase.
There are different kinds of motherboards. The different boards have a different connector for the power cable. ATX is the standard, but you don’t want to make an assumption and then waste your money. You could potentuially have a an AT type motherboard.
There are single rail and multi rail power supplies. As long as you have a stable power source you will be good with a single rail. If you struggle with power outages or your power fluctuates then you’ll need a multi rail.
A power supply is a long term purchase. If you get a good one, you can expect to keep using it for 5 to 7 years! When you upgrade your system this little guy can still be used. If you do ever decide to upgrade your power supply, these things have a resale value.
Because a power supply doesn’t degrade over time, it holds it’s value at a descent rate and you can look at selling your old one on Craig’s List or a similar site.
THere are a good number of companies that make and sell power supplies, but not all of them have the same quality. Remember how I said this was super important? Getting this wrong can cause catastrophic issues with you computer.
Loyalty to certain brands is the norm for power supplies. My personal favorite is the Cool Masters, but Corsairs is also a good one.
As always, if you think I missed an important aspect, or just have any general questions, leave a comment below and I’ll be happy to offer assistance.