Best LGA 1155 CPU in 2021

Five CPUs That Will Breathe New Life into Your LGA 1155 Motherboard

You and your LGA 1155 socket motherboard may have just celebrated your tin anniversary together, a landmark that can definitely spark doubt in any gamer’s mind about whether it’s time to upgrade, but we’re here to show you that your partnership is far from over.

The LGA 1155 socket encompasses two whole generations and one full tick-tock cycle of Intel CPUs, so there’s tons of compatible hardware to check out. Anything with Sandy Bridge or Ivy Bridge microarchitecture is a possibility.

When you’ve been running the same motherboard for over 10 years, it’s only natural for you to ask yourself if you’ve taken things as far as you can go. You wonder if it’s time to retire the old fella, but before you say your tearful goodbyes, take a quick look at our list of the five best LGA 1155 CPUs.

The LGA 1155 socket may be older than most of our children, but that’s not to say we’ve forgotten about it and all the wonderful CPUs it supported. Doing the research and testing for this list was a satisfying trip down memory lane, and it rekindled our love for our personal favorite CPUs, CPUs that we ran in our gaming rigs for years, CPUs that were a huge part of our own childhoods.

It’s not just because of the stringent testing methods we use that we know which products to present to you. We already know from experience which LGA 1155 CPUs are the best because they’re the ones that provided some of our favorite gaming experiences of bygone days. They’re the ones that sparked a lifelong obsession with PC gaming and why we chose to make a career out of it.

Our Recommended

Best LGA 1155 CPU in 2021

Editor's Choice

4 hyperthreaded cores are perfect for multitasking

Ivy Bridge architecture offers the best LGA 1155 performance

Very energy efficient

Large thermal capacity for overclocking


Heats up quite fast during OC, so you’ll need to optimize cooling

Quite pricey for a 9-year-old CPU

If you’re determined not to fall behind in gaming or general computational contexts, the Intel i7-3770K is hands down your best option. Featuring four hyperthreaded cores with 8 threads in total, multitasking isn’t a problem. You’ll even be able to run pretty advanced video editing or 3D rendering software without any hiccups. Being that this an Ivy Bridge unit, it’s not quite as old and is slightly more advanced than a lot of other LGA 1155 options on the market, so it has held its price very well, but if you’re looking to shock some life into that aging motherboard, the i7-3770K is the defibrillator you need!

That the Intel Core i7-3770K is the best LGA 1155 CPU is objectively indisputable. Built on the Ivy Bridge blueprint, it promises slightly faster performance, lower energy consumption, and better security features than anything the Sandy Bridge series has to offer.

While you’re stuck with a maximum of four cores no matter which LGA 1155 CPU you settle on, the i7-3770K features the cream of the 2nd and 3rd gen core crop. Not only do they provide faster per-core performance than most other LGA 1155 CPUs, but they also feature hyperthreading, offering huge potential for multitasking. If you appreciate versatility in a PC, the i7-3770K won’t disappoint.

Moving on to gaming specifically, you can absolutely punch some decent frame rates out of this CPU in 1080p when paired with a decent mid-range CPU such as the GTX 1070 Ti or GTX 1660. Anything beyond that and you may witness some bottlenecking.

With a base frequency of 3.5GHz and a boosted rate of 3.9GHz, this CPU’s clock speeds land right in the sweet spot for some silky smooth gaming. Being that this quad-core monster only pulls 77 watts and has a relatively high thermal headroom, overclocking can be fruitful, stable in the region of 4.6GHz with air cooling, but the heat ramps up pretty fast, so we’d recommend a custom loop.

Not that you’ll really need it, but the i7-3770K comes loaded with an integrated Intel HD 4000 graphics card. It’s no replacement for a discrete GPU, but it’s a nice touch from Intel.

Best Value

4 hyperthreaded cores are great for most workflows

Unbeatable price to performance ratio

Decent 3.4GHz and 3.9GHZ clock speeds

Can be overclocked to around 4.3GHz


Not quite as much headroom for OC-ing as the ‘K’ edition

Base is 1GHz below the recommended clock speed for gaming

The standard i7-3770 bears a striking resemblance to the K-series edition. It’s a hyperthreaded quad-core, top-tier Ivy Lake processor with exactly the same 32GB memory and DDR3 1333/1600 support. It’s fantastic for gaming, casual use, and as a workstation too. So, what exactly is the difference here? Well, for one thing, it’s almost a third of the cost of the i7 3770K, and honestly, that’s the most significant defining factor between them. The only areas costs have been cut are the 1GHz lower base clock speed and slightly less thermal headroom for overclocking, so if you want to get the best bang for your buck, check this i7 3770 out!

Our second LGA 1155 champion is the i7 3770, which is virtually the same chip as our top pick, but it can be snatched up for a song. We’re talking almost a third of the price of the K-series chip. That probably sends your spidey senses tingling, alerting you that something’s not quite right, and while it’s shrewd to be weary, honestly, it’s just a fantastic value-for-money chip.

That’s not to say there aren’t some minor differences. They’re just majorly disproportionate to the huge amount of money you save. All you’re missing out on when you drop that ‘K’ suffix is 1GHz of base clock speed, leaving you with 3.4GHz, yet parity remains intact in terms of boosted rate, maxing out at 3.9GHz

The only other difference between this and the K-series chip is that you don’t get quite as much thermal headroom for overclocking, but you can still push 4.3GHz without too many problems at all. Besides these minor diminishments, they might as well be the same CPU. They have the same memory configurations and support, and the 3770 even has the same integrated Intel HD 4000 graphics card.

So, if the i7-3770K was a little rich for your blood, treat yourself to this chip, and give yourself a pat on the back for being such an awesome bargain hunter.

Best Budget

Fast single-core performance ideal for gaming

Great clock speeds reduce latency

4 cores are all you need for some immersive gaming

Integrated Intel HD 2000 graphics card


Not brilliant for multitasking

Graphics card isn’t as good as our top picks

Coming in at number three we’ve got one of the best LGA 1155 i5 processors. Some gamers may be put off by the fact it’s a single-thread quad-core CPU, but therein lies this chip’s biggest strength. The single-thread cores excel during focused tasks, giving this chip a similar gaming performance as our top two cards. The price you pay is a reduced capacity for shouldering parallelizing workflows, but if all you’re after is a standalone gaming CPU, the i5-3570 is everything you’ll need to play most modern games.

Our first i5 offering may seem a tad on the humble side, but just wait until you see what this thing can do in real-life gaming scenarios. Teamed with a half-decent GPU, in 1080p resolutions with the settings on high, you can expect it to break the desired 60 fps average without breaking a sweat. It even holds the 50fps threshold in 1440p on high settings.

Why is this? The single-thread cores are designed to go hell for leather during individual applications, so as long as you don’t overload it with tasks, it will perform incredibly well, especially for a card that costs less than $100.

Sharing the same 3.4GHz base clock speed as the i7 3770, it only drops a 1GHz from our top two pick’s 3.9GHz maximum boosted rates. These epic clock speeds are another reason why this chip doesn’t lag behind its more expensive CPU cousins.

What this chip is lacking in is the ability to deal with threaded workloads, so if you often challenge your CPU with simultaneous applications and demanding programs, it’s probably not the chip for you.


Great price

Decent clock speeds should be able to handle most modern games

Integrated Intel HD 2000 graphics card

4 cores make this a great standalone gaming CPU


Poor performance during threaded workloads

Higher power consumption means higher temperatures

No future-proofing means you’ll have to replace sooner rather than later

Integrated graphics card is a little weak

From the not-so-distant topiaries of Ivy Bridge, we have finally arrived at the sizable 32-nm Sandy Bridge, but before we cross, a few preliminary observations. Sandy Bridge microarchitecture isn’t quite as efficient as Ivy Bridge, and that’s in terms of both performance and power consumption, but that’s not to say this chip isn’t perfect for some gamers.

It’s still a quad-core processor, so there are no problems there. The single-thread design can really move during most gaming scenarios, pumping out playable frame rates in 1080p on high settings. Again, this i5 isn’t ideal for concurrent workloads, so if you’re looking for an all-rounder chip, you may want to scroll back up and reconsider the hyperthreaded options.

Clock speeds are impressive, that 3.5GHz sweet spot sitting right in the middle of its 3.3GHz base and 3.7GHz boost frequency. You can still run 3.5GHz requirements games on that 3.3GHz base, but switch on Turbo Boost Technology in the BIOS and you should be able to play roughly 71% of the top 1000 games.

We’d say the largest difference between this chip’s Sandy Bridge building blocks and those of Ivy Bridge is the power consumption. The 95-watt draw means a hotter case. Add that to the locked multipliers and you’ve got an OC-ers nightmare.


Integrated Intel HD 2000 graphics card can be OC-d meaning for very basic older games, you may not need a discrete GPU

2 hyperthreaded cores enable basic multitasking

Fantastic budget option

3.3GHz clock speed should be plenty for most games


Dual-core design limits performance

Not suitable for some newer games, nor is it futureproof

No Intel Turbo Boost so you’re stuck with base clock speeds

Featuring just 2 cores, you could say the i3-2120 is a little light on hardware, but thanks to Intel’s hyperthreading technology, you have four threads for handling some basic multitasking. Having said that, it’s best to let it focus solely on the task at hand when gaming.

Many will turn their nose up at the simplicity of this card…it doesn’t feature Intel Turbo Boost technology, and it can’t particularly be overclocked. Well, we see the i3-2120’s stripped-down nature as endearing. It’s perfect for a young gamer, a beginner gamer of any age, or for those who enjoy playing older games.

The fact that it’s not the cheapest chip on our list is testament to its abilities and relevance. The 3.3GHz clock speed may be just short of the desired frequency for gaming, but it can still play most games.

One thing we will say is that even with 2 hyperthreaded cores, the i3-2120 isn’t particularly futureproofed, so if you plan to keep up with new releases moving forward, you will have to fork out for a more powerful processor.

Things To Consider

Intel vs AMD

The two big silicone slingers at the moment are Intel and AMD. Up until very recently, Intel CPUs were regarded as the fastest for gaming, their single-core design, excelling during focused workflows. After years of trying, AMD has finally taken the gaming throne with their latest generation of Zen 3 CPUs.

Historically, AMD is seen as more of a gamer-friendly brand as they produce many backward compatible CPUs whereas Intel drops motherboards like they’re going out of style. AMD CPUs also usually start at slightly lower prices than their Intel equivalents, but we don’t need to worry so much about that in this instance.

Cores and Threads

Once you’ve settled your internal Intel/AMD debate, the next thing you should consider is core-count and core style. Cores are the fundamental aspect of any computer processor. They’re in charge of managing data and executing instructions. Generally speaking, the more you have, the better your PC will run and the more it will be able to do, especially simultaneously.

Core threads are sort of the task managers of each core. There are only ever one (single-threaded) or two (hyperthreaded) threads per core. Single-thread cores offer swift support for singular tasks. Hyperthreaded cores enjoy supporting multiple applications at the same time.


The architecture of your CPU refers to its basic building blocks as well as most functionality. It’s a little reductive, but new architecture is typically preferred to older generations. New architecture almost always allows for a greater number of CPU cores whilst simultaneously lowering power consumption. A newer design may also have entirely new processes or hardware unseen in previous generations.

LGA 1155 sockets are compatible with two architectural generations of Intel Processors: Sandy Bridge and Ivy Bridge. Ivy Bridge is the latest of the two, but it’s what’s known as a tick update, meaning it’s only slightly improved over Sandy Bridge, rather than being a whole ‘tock’ step up.

Our Verdict

Editor's Choice

So, those are our LGA 1155 CPU suggestions, not bad, ay? As you can see, there’s no need to commit that LGA 1155 motherboard to the towering heights of your local landfill just yet. There’s still plenty of piss and vinegar coursing through its fiberglass skeleton.

The i7-3770K is objectively the best chip of the bunch, so if you’re looking for something that won’t just blow away those LGA 1155 cobwebs, but tear them away in a silicone storm, it’s the one to go for. The high clock speeds and hyperthreaded quad-core design is ideal for almost all modern computational applications.

Alternatively, if we were picking out one of these CPUs today, we’d go for the i7-3770 as it has very similar performance and a price tag that defies all reason. If you want to go even cheaper, though, the i5-3570 has those punchy single-thread cores itching to push your games to the limit.

Our penultimate CPU, the i5-2500, is another awesome budget option, and despite that Sandy Bridge architecture, during most games, it can really fly. It’s not for the OC addicts out there, but if you have a lower-end LGA 1155 board, it’s a lovely fit. Finally, our dinky dual-core dynamo, the i3-2120, is great if you’re just starting your gaming adventure.