Plan to Buy Power Supply for Gaming PC? Read this first
So do you know what to consider when you need to buy power supply unit for gaming? Choosing the right power supply for a new gaming computer build can be confusing. Look around for advice on which PSU to buy and you’ll get all sorts of responses.
There’ll be some who recommend buying any cheap PSU to save money, others who fiercely condone anything but buying an absolute A-list top-notch model to avoid your new system exploding within the week, and everything else in-between. So, what’s the real answer?
Is choosing a good PSU really that important when building a gaming PC? Can you get away with a lower-cost budget unit? And what do all the features and specs mean anyway?
Is an 80 Plus Bronze rated PSU good enough? How much extra wattage should you account for? All fair questions, and without a doubt picking a PSU rates up there as one of the more confusing hardware component selections when planning your first gaming PC build.
You don’t need to understand all PSU specs in detail to be able to choose a power supply, but if you have any burning questions chances are we’ll cover them in this guide so let’s get into it and take your power back.
After reading you’ll literally know more about PSUs than 95% of gamers and will never have to succumb to poor advice on a random forum ever again.
Does the Power Supply Matter for a Gaming PC?
Choosing the right power supply for a new gaming computer is an often-overlooked aspect of building a PC, especially if you’re a beginner. Kinda makes sense though, right? You’d be forgiven to think that a power supply is just, well, a power supply, and that it doesn’t really matter in the grand scheme of things.
“It’s just a freakin’ power supply… I’ll pick the cheapest I can find to save some cash” – Joe Noob
Bad move, hombre. Some things are only as strong as its weakest link, and computers are one of those things. Whilst a power supply isn’t going to directly affect gaming performance, and in some cases (pun intended) there’s no need to throw down serious cash on a top of the range PSU, choosing a power supply that’s of good-enough quality and reliability is important to power all your precious new PC components for years to come without putting your system (and wallet) at risk.
Pick the wrong PSU for your gaming PC and s*** might just hit the fan
Buying any random cheap PSU to save money can spell trouble real fast, and they can bring about all sorts of problems all the way from increasing your electricity bill due to low efficiency to potentially blowing up your new pride and joy (rare but it happens).
With a low-quality PSU in your gaming PC, you’re risking a premature failure of your unit that may take your other parts with it if you get unlucky.
There’s also further downsides to a bad PSU besides higher risk to your system and lower efficiency. For example, some cheap PSUs have bare cabling which can even leak RF energy. Some are also loud as hell and will hinder the enjoyment of your new system.
Then there’s those budget PSUs which will overheat very easily. Moral of the story? Every time you buy a bad PSU for a good gaming PC, an innocent kitten dies somewhere in the world. Be a good person and pick a PSU that’s at least of decent quality – ideally a good quality unit that’s also approved by the DIY community (do your research).
How to Choose Your Power Supply Wattage
Gaming computers vary greatly, from $300 scrappy entry-level gaming builds that you probably wouldn’t ever tell anyone about, to $3000+ ultimate monster PCs that you wanna brag about to your buddies on Instagram. Therefore logically, PSU power requirements vary greatly too.
As a general rule of thumb though, for most gaming PC builds these days, you’ll probably need to choose a power supply that has a wattage somewhere between 450 watts to 850 watts.
95% of PC builds are going to fall within this range, unless you’re either building an anomaly of a system that’s either under $300 (good luck with that) which may not even need 450 watts, or an ultra extreme rig in the many thousands of dollars with a ton of extra add-ons that may actually genuinely require more than 850w (such as a multi-GPU SLI gaming PC).
However, what you wanna do is calculate roughly how much power your full list of parts will require (don’t forget accessories like hard drives and any extra case fans), and choose a PSU that has slightly more wattage than what you need. So, if your parts list requires around 400 watts, then get a 500-550 watt unit to be safe, or a 600 watt one if you’re confident you’ll be doing a fair bit of upgrades later on.
How much headroom you leave in terms of wattage doesn’t just depend on the potential upgrades you plan to make, but also if you’re overclocking your gaming computer which will require additional power.
Tools to Check PSU Wattage Requirements
There are online PSU wattage calculators you should use to make things easy, such as PCPartPicker’s built-in wattage estimation or the Outervision Power Supply Calculator. These tools will save you having to manually figure out how much wattage all your PC parts will need; a laborious task I wouldn’t assign to a sworn enemy.
But also keep in mind a common rookie mistake when choosing a PSU is actually getting one that has much more wattage than you actually need. For example, someone may be building a PC that requires roughly 550 watts, yet they go for an 850 watt unit.
That’s okay if you intend on many upgrades, but is likely overkill for most and you could be wasting money on something you won’t ever need. Leaving a good 100-150 watts of headroom (200 if you really want) is more than enough for most.
What About Maximum Power Output vs Peak Power Output?
It won’t matter to most of you choosing a power supply, but it may come up in your research and make you wonder. There’s a difference between the maximum power output and the peak power output of a PSU.
The maximum power refers to the continuous or stable power that the PSU can produce consistently, while the peak power is the elevated maximum surge the PSU can produce for a limited amount of time (for example 10 seconds). The important one to look for is the maximum power output.
Power Supply Size Differences Explained
Another spec to know about besides the wattage is the size of a PSU, technically called the form factor. ATX is the standard form factor (technically ATX12V) and will fit in any ATX computer case, and is what 95% of PC builds will be.
However, while the width, height, and screw placement is the same for all ATX power supplies, the depth of the unit can vary. PSUs are usually 6 inches deep, but powerful PSUs with high wattages may be deeper, so make sure to check that your PSU fits if you’re opting for a high-powered unit and placing it in a mid-tower or smaller case for example.
What Are SFX PSUs?
There’s also such a thing as SFX sized power supplies (technically SFX12V) which are designed for use in small form factor cases, which might be something you need if your case only lists support for SFX units. If that’s the case, pun intended, it’s hard to ignore Corsair’s range of SFX PSUs such as the SF600: (Seasonic’s Focus SGX-650 is also great)
What is a Modular and Semi-Modular PSU?
A modular power supply is simply one with the ability to detach any excess power cables that you don’t use, which leads to less clutter within your PC case, which then may lead to better overall airflow/cooling, less dust build-up, and it also looks neater (which matters if you’re showing off your build with a see-through side panel case).
Modular PSUs cost more than normal, non-modular units, and whether or not it’s worth the higher price will depend on your personal preference. Having a chunk of leftover cables that you can simply tuck away within your case somewhere may not bother you, especially if you have a case with plenty of room to tuck them away neatly.
If you’re on a budget and trying to cut costs as much as possible, just get non-modular if you can’t find a modular unit at a price you like. Otherwise, if you’re building a high-end or extreme custom gaming computer where price isn’t as much of a factor, if you want the best gaming PSU you can get then always go modular as it’s obviously the most convenient and will make doing power supply cable management easier.
Lastly, there are also such a thing as semi-modular PSUs which is, convenience-wise, in the middle of modular and non-modular power supplies and only come pre-attached with the absolute essential power connections which means less clutter than a non-modular unit but not as much flexibility as modular ones.
Power Supply 80 Plus Ratings Explained
Power supplies have various efficiency levels which is one measure of how good a particular unit is. More efficient PSUs not only draw less power, meaning lower energy bills, but they produce less heat and therefore less noise as well.
The efficiency of a power supply is given a rating, with “80 Plus” being the bare minimum rating you should go for. Meaning, if a unit doesn’t have “80 Plus” mentioned somewhere then chances are you should avoid it.
There are always exceptions to the rule though, but in general opt for a 80 Plus unit or better whenever you can. There are levels to 80 Plus ratings, with basic 80 Plus, then 80 Plus Bronze, Silver, Gold, and Platinum, in order from least to most efficient. For super powerful gaming computers you’ll want a gold rated PSU or better for maximum efficiency.
What Are the Best Power Supply Brands?
Sticking to known, reputable, reliable brands is important when selecting any hardware component, but especially crucial when it comes to choosing a power supply.
As mentioned earlier, skimping on your choice of PSU and just haphazardly picking a cheap, perhaps generic no-name brand unit to save a few bucks is not the wisest move if you care about your computer both now and over the long haul.
As for the best PSU brands as of the time of writing this guide (2019), some of the best PSU manufacturers overall right now would have to be Seasonic, EVGA, Corsair, Antec, XFX, Silverstone and Thermaltake (in no particular order). But here’s the thing: you also have to look into the specific model as well as even the best brands in the world are capable of making slightly sub-par quality units (at least compared to other available options in that price range). All these brands have lower-tier PSUs you likely want to avoid.
Yup, even though they’re one of the absolute best PSU brands, there’s even a couple Seasonic PSUs I’d personally steer clear of (but yeah, most Seasonic units are top quality).
Overall, sticking to the mentioned brands above is recommended if you want to choose the best PSU for your system, although the more powerful your PC the more important it is to do further research and ensure the exact PSU you choose is a good one.