Intel i3 vs i5 vs i7 – Which should you use for gaming?

Updated: July 9th, 2018Author: BrantonCategory: GuidesLeave a Comment

i3 vs i5 vs i7 gaming

So, you’re building a new PC for gaming (maybe upgrading an old one?) and you want to use an Intel processor. But, you’re hung up on whether to use an i3 vs i5 vs i7.

No problem! Let’s go over what sets each of these processors apart including their merits and flaws when gaming.

i3 vs i5 vs i7

Whether you’re wondering if it’s actually worth it to drop the money on an i7, or you’re trying to save as much money as possible without skimping on your build, it always pays to know what you’re buying before you buy it. That said, it’s a good thing you’re here!

For the purposes of this article, let’s assume that you’re getting at least an 8th generation Coffee Lake processor; like the i3 8100, i5 8400, or i7 8700. If you’re not, you should consider it because the 8th generation is a major upgrade on everything prior. Desktop-based Core i3 processors are now mainly 4-core/4-thread, i5 processors are primarily 6-core/6-thread, and the i7 lineup is generally 6-core/12-thread thanks to Hyperthreading.

As you’re probably assuming, i3 perform the worst, i5 are in the middle, and i7 are the best. But, that doesn’t mean you have to buy an i7 to play games comfortably, not even close!

Here’s an example of what I mean, it’s a benchmark comparison between an i3 8100 and an i5 8400, both running the exact same GTX 1060 6GB graphics card:

That’s some pretty impressive performance coming out of the i3 8100! Keep in mind the i5 8400 has 2 more cores and threads than the i3 8100 does. Either way, 120fps in Battlefield 1, 60fps in Arma 3, 140fps in ME: Andromeda, and during the driving portion of the GTA:V benchmark (a very CPU heavy game) there were points when the i5 and i3 performed almost identically! That’s decent and not what we would have expected from previous generations.

Like I said, there’s definitely no need to feel like you absolutely must buy an i7 or an i5 otherwise your gaming PC will be bad! It’s quite the opposite as you could easily build a sweet setup while using something as seemingly basic as the i3 8100.

If you’re sitting there thinking “yeaaah right, the i3 suuuucks!”, then I have one more benchmark comparison for you. The i3 8100 vs i7 8700K comparison. Both setups are running the same GTX 1070 8GB.

Crazy, right? There wasn’t even a massive difference in a lot of the games tested. Granted, there was a 50fps or so difference in Battlefield 1 and there’s a noticeable difference in frame times throughout every game, but when you’re comparing a $130 and a $350 CPU there have to be some compromises!

Which to use for gaming?

Obviously, anything from the i7 lineup is going to net you the highest performance. But, they’re also going to cost you the most, and in some cases you would probably be better off putting the extra $100 or so towards a stronger graphics card (GPU) or more system memory (RAM). That said, if you’re aiming for high frame rates in 4K, an i7 is definitely the way to go.

Generally speaking, an 8th generation Intel i5 is more than enough for comfortable gaming at practically any resolution. They’re basically on par with last generation’s i7 lineup which is rather impressive – an i5 8400 can pretty much keep up with an i7 7700 as an example. This is what I’d suggest for most people unless you’re spending upwards of $1500 on your build and are looking for a super smooth 4k+ experience.

Like we saw in the benchmark comparison videos, the i3 8100 is no slouch either. It has no problems putting out great frame rates in pretty much any game out there. This is a great CPU to pair with graphics cards from the GTX 1050 all the way up to a GTX 1060 or RX 580 – or pretty much anything if you wanted to.

If, for some reason, you’re upgrading or buying an older processor, the old rules (I just made them up) still apply. The i3 lineup is not ideal for gaming, you should save more for an i5 in this case. The older i7 lineups, are still solid to a point and can perform quite well… Just nowhere near the 8th gen most of the time.


When you’re building a gaming PC, your graphics card should always take precedence over your processor – it’s doing the bulk of the work when gaming after all. An i3 8100 paired with a GTX 1070 is going to outperform an i7 8700K paired with a GTX 1050 Ti every single day. In terms of strictly gaming, of course.

If you’re an “eSports” streamer (CS:GO, Dota2, LoL, Rocket League, things like that) then a setup running a top-of-the-line CPU paired with a weaker GPU might not be a bad idea. But, for everyone else, you pretty much always want to focus on your GPU.

That’s why most people should ignore the i7 lineup, unless you’re spending a good amount on your build anyway or you actually need the CPU power for something productive. Otherwise, an i5 would work great while saving you around $100 that could be dedicated elsewhere – like a better graphics card.

Even the 8th generation i3 lineup has its merits when gaming and should not be overlooked just because you might have read a 4-year-old forum thread about how weak the old ones were!

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Hey there! I'm Branton, the founder and lead editor here at PC Game Haven. Since our launch in 2015, we've helped thousands upon thousands of gamers build their dream desktops, find the perfect peripherals, and more. Thanks for stopping by!