How to Overclock Your Graphics Card

How to Overclock Your Graphics Card
(Image credit: Tom's Hardware)

Overclocking your graphics card can improve its performance by 5% to as much as 15% (or more), depending on the particular card model. Of course, as with any overclocking, care should be taken to avoid running your GPU at unsafe settings. But if you have one of the best graphics cards and you're looking to eke out a bit more performance, we'll discuss how we go about overclocking and determining "safe" settings.

Before overclocking, it's important to get a baseline measurement of how your graphics card performs. You want to be able to see how much faster your PC runs after tuning, after all — if performance doesn't improve, you'll want to know. Check our guide on how to test graphics card performance, and you'll also want to check your graphics card temperatures and clock speeds.

Once you have your baseline stock performance data, it's time to start overclocking. There are a variety of utilities, but we're going to focus on MSI Afterburner, which is one of the most popular and commonly used GPU overclocking tools. The same basic process can be used with other utilities, including EVGA Precision X1, Asus GPU Tweak (opens in new tab), and other graphics card vendor utilities. It's also possible to overclock AMD and Nvidia GPUs using the built-in utility in AMD's drivers or Nvidia's GeForce Experience, which we'll cover below, but we'll start with the universal approach to overclocking your GPU.

Please note that overclocking very much depends on the "silicon lottery." Just because one person with a "HappyGPUs RTX 4090 X-Factor-Wow" model card (that's a made up name, if you couldn't tell) managed a 20% core overclock and a 25% memory overclock doesn't mean that every HappyGPUs RTX 4090 XFW card will hit those same clocks. Case in point: Even though all the RTX 4090 cards (opens in new tab) we've seen so far appear to use Micron 21Gbps GDDR6X memory (opens in new tab) ("D8BZC" labeled chips), we've seen maximum stable memory overclocks range from 22.6Gbps to as high as 25Gbps.

Overclocking With MSI Afterburner

(Image credit: Tom's Hardware)

Here's the main interface for MSI Afterburner, using the v3 skin. It shows sliders for core voltage, power limit, core clock, memory clock, and fan speed. By default, Afterburner locks out voltage adjustments. If you want to play with that, go into the settings and check the box for "Unlock voltage control." You can try setting it to reference design, standard MSI, extended MSI, or third party — some cards will only allow voltage adjustments with the correct mode, and some might not allow it at all.

One option for overclocking is to use the automatic OC scanner tool. Press Ctrl+F, then click the OC Scanner button in the top-right corner and let it do its thing. This is supposed to make overclocking easier, but as with most auto-tuning utilities, your mileage may vary. We've had it crash, and we've had it generate unstable overclocks as well. It doesn't do anything for memory clocks either, so you'll likely end up going the manual route. The OC scanner can take 20 minutes to run, and most of the time, you can get a quick and easy overclock much faster on your own.

My approach is to fire up a graphically intense game or benchmark that will run in a window, then I run the game at 1920x1080 or 2560x1440 (depending on the GPU I'm using) and get to a spot where nothing is going to kill me. From there, I switch over to Afterburner and start trying some adjustments. Note that you'll want a game or test that doesn't stop rendering when you leave focus (so if it shows the menu when you Alt+Tab, that's not going to work).

There are four primary points of interest when overclocking a graphics card: GPU core clock, memory clock, GPU voltage, and fan speed. (In some cases, you can also adjust memory voltage.) I start by finding the maximum "stable" core clock, then I find the maximum "stable" memory clock, and then I try to find a blend of the two that results in optimal performance.

Note that "stable" is in quotation marks because even if the initial testing seems to work fine, there will often be exceptions where some games or applications crash while others work. When that happens, you'll have to go back to tune the settings and see if you can find some that allow the game to run properly. As you can probably guess, the more demanding the game (i.e., if it uses ray tracing and DLSS on an Nvidia GPU), the more likely it is to require additional fine tuning and lower clocks.

(Image credit: CD Projekt Red)

For this tutorial, we'll use Cyberpunk 2077, running in a window at 2560x1440 with RT-Ultra settings and DLSS Quality mode, to find a reasonable overclock for a GeForce RTX 3090 Founders Edition card. That ticks all the boxes for a demanding game that will likely push the GPU to its limits, and it also has a built-in benchmark that will let us see what happens to performance after tuning.

We started with a GPU core overclock. After loading the game and applying the appropriate settings, we maxed out the power limit and set the fan speed to 80% to ensure the GPU and memory stayed cool. Everything was fine so far, and we applied a 100 MHz offset to the GPU core. That worked okay, which is almost always the case — if you can't get at least a 100 MHz core overclock, you probably shouldn't worry about going any further with your particular graphics card.

With that initial performance boost in play, we then tried a 150 MHz core overclock… and Cyberpunk 2077 almost immediately crashed. We tried maxing out the core voltage after restarting the game, and it still crashed, which means a 150 MHz offset won't work. We split the difference and dropped to 125 MHz, which also crashed. It appeared reasonably stable after maxing out the core voltage at +100, but that also crashed after several minutes.

Ultimately, +100 MHz on the GPU cores appears to be as far as we're likely to get with this card, though do note that the increased power limit means we're running quite a bit faster than at stock — GPU clocks hovered around 1755 MHz at stock, compared to 1905 MHz with our overclock. A big chunk of that comes thanks to the increased power limit, as even with a 0 MHz GPU overclock, we saw average clocks of 1875 MHz in our testing.

Next, we worked on a memory overclock. We dropped the GPU core clock back to +0 MHz but left the power limit at the maximum (114% on this card). There's usually a fair amount of headroom, so we started with a +750 MHz offset on the GDDR6X memory. That gives an effective memory clock of 21Gbps, and after several minutes of running around in the game, we figured it was working fine. +1000 MHz (21.5Gbps) also appeared stable, as did +1250 MHz (22Gbps), but +1500MHz immediately crashed our system and forced a system restart. Did we mention overclocking can be a trial and error process?

After additional tinkering and testing, we combined the GPU and VRAM overclocks to end up with +100 MHz on the GPU core and +1000 MHz on the GDDR6X memory. Note that Nvidia's RTX 30-series GPUs have "error detect and retry" on the memory, which can sometimes obscure borderline unstable overclocks, and we figured 21.5Gbps was sufficiently fast.

GPU Overclocking Performance

What did the above do for performance? Here's how the stock, GPU core only, VRAM only, and GPU plus VRAM overclocks fared at 4K RT-Ultra with DLSS Quality in the built-in Cyberpunk 2077 benchmark. We also tested a second game, Borderlands 3, at 4K and Badass settings with the same four GPU settings.

We'll forgive you if that feels underwhelming. Ultimately, our maximum GPU overclock improved performance on the RTX 3090 by 8.6% in Borderlands 3 and 8.5% in Cyberpunk 2077. Most of those gains came from the GPU core overclock, which improved performance by 7.3% in Borderlands 3 and 7.5% in Cyberpunk 2077. Meanwhile, just overclocking the VRAM improved performance by 2.1% in BL3 and 6.0% in CP77.

Your actual gains can vary a lot, depending on your graphics card. For example, the RTX 3090 isn't known for being memory bandwidth starved in most cases, but the reference model definitely runs into power limits at stock. That's why the core overclock mattered more than the VRAM overclock. Still, the results we've shown above aren't atypical for graphics card overclocking, and we usually see about a 5–10% improvement in performance.

AMD and Nvidia "Built-In" Overclocking

(Image credit: Tom's Hardware)

You can use other tools to overclock your GPU, but if you don't want to bother with MSI Afterburner, you should probably just use the built-in tools provided by AMD and Nvidia. Nvidia provides an auto-tuning tool and you can specify voltage and power limits, a temperature target, and a fan speed target. After that, you just leave it up to the drivers, which will overclock the GPU cores but not the VRAM.

(Image credit: Tom's Hardware)

AMD's overclocking tools built into Radeon Settings are far more useful. You can do everything you need, specifying voltages, clock speeds, fan speeds, memory speeds, and more. You can also ask the drivers to overclock the VRAM or the GPU — but not both. Alternatively, it can auto-undervolt the GPU, which reduces performance a bit but also tends to lower temperatures and power use. Basically, you don't need a separate GPU overclocking utility, though we still generally find MSI Afterburner to be more familiar and easier to use.

One big benefit of AMD's overclocking tools is that you can specify per-game OC profiles. Maybe one game isn't as intense and you can push clocks higher, or maybe you have a game that just needs the extra oomph to provide a smoother gameplay experience. It can be as complex or as simple as you want to make it, though ultimately, it will often still come down to trial and error.

Bottom Line: GPU Overclocking

(Image credit: Jean Michel "Wizerty" Tisserand)

Should you overclock your graphics card? We could be cheeky and say that if you need to ask, you should probably just leave well enough alone. The reality is that AMD and Nvidia — and their graphics card partners — tend to bin the chips and push performance nearly to the limit. Overclocking also increases the power use and often the temperature of your graphics card, which can cause it to wear out sooner. But perhaps even worse than that is the fact that overclocking usually only improves performance by 5–10%.

That might be noticeable, to some people, without running a bunch of benchmarks. In practice, there's usually not enough headroom that it's worth the hassle. You can give the auto-tuning options in the AMD and Nvidia drivers a shot, and that will probably get you at least half of what you'd get with manual tuning. Plus, it's a simple flip of a switch rather than something that requires a lot of trial and error.

As someone who has done a lot of overclocking over the years, I can say that one of the worst feelings is when you're in the middle of a game and it suddenly crashes due to a formerly "stable" overclock. You're then in the unenviable position of wondering if there's a bug in the game, if your overclock pushed too far, or if there's something else wrong with your PC. I've lost countless hours troubleshooting my PCs, and these days I just don't find GPU overclocking to be particularly important.

You don't have to agree with me, however; perhaps your particular hardware will deliver a bigger boost in performance after tuning. Just keep an eye on your GPU and VRAM temperatures, and don't forget to give your PC a regular cleaning to keep it running smoothly. Also, don't go into GPU overclocking expecting a 20% improvement or more in performance, because those days are far in the past — unless you use liquid nitrogen.

Jarred Walton is a senior editor at Tom's Hardware focusing on everything GPU. He has been working as a tech journalist since 2004, writing for AnandTech, Maximum PC, and PC Gamer. From the first S3 Virge '3D decelerators' to today's GPUs, Jarred keeps up with all the latest graphics trends and is the one to ask about game performance.

  • Phaaze88
    Aye, Nvidia's Gpu Boost already squeezes most of the core clock OC out of their gpus. Plus, if you bought an mid/upper tier aftermarket model - that adds a few % more on top of that...
    There's really not much left without some exotic cooling and modding of the power limits.
    Reply
  • jtcmedia
    I think the days of GPU/CPU overclocking are over. It's just so competitive between AMD/Intel/NVIDIA that they squeeze every ounce of performance out of there hardware at stock. Like @Phaaze88 said, you need some custom cooling and modding to overclock these days and the gains will be minimal.
    Reply
  • yzonker
    This article has a couple of errors/misconceptions.

    1) The voltage slider only gives access to the last few voltage points on the VF curve. It has no effect on how large of a core offset you can run. Also, most 3090's are power limited to the point that the core will never see this higher voltage allowed by maxing out the voltage slider in games like Cyperpunk. Even if the card can reach the voltage limit, this will still not change the max core offset that is stable usually (since the core frequency will increase as well as voltage as the card follows the VF curve). The VF curve can be seen in Afterburner by hitting "Control-F".

    2) Memory overclocking is more tricky than just upping it until the game crashes. There is some sort of error correction done by 30 series GPU's that will cause regression in performance before actual instability is seen. So the only way to properly max out the mem overclock is to increase it in +100 increments and run a reliable benchmark (like the one in CP2077, or just use one of the 3DMark benchmarks like Port Royal or Time Spy) to see if the score improves. Most cards will see a regression in score before actually crashing.
    Reply
  • sizzling
    yzonker said:
    This article has a couple of errors/misconceptions.

    1) The voltage slider only gives access to the last few voltage points on the VF curve. It has no effect on how large of a core offset you can run. Also, most 3090's are power limited to the point that the core will never see this higher voltage allowed by maxing out the voltage slider in games like Cyperpunk. Even if the card can reach the voltage limit, this will still not change the max core offset that is stable usually (since the core frequency will increase as well as voltage as the card follows the VF curve). The VF curve can be seen in Afterburner by hitting "Control-F".

    2) Memory overclocking is more tricky than just upping it until the game crashes. There is some sort of error correction done by 30 series GPU's that will cause regression in performance before actual instability is seen. So the only way to properly max out the mem overclock is to increase it in +100 increments and run a reliable benchmark (like the one in CP2077, or just use one of the 3DMark benchmarks like Port Royal or Time Spy) to see if the score improves. Most cards will see a regression in score before actually crashing.
    Regarding the memory point I read about this many gpu generations ago, I think it might have been when I was overclocking my old 780. I don’t know anything more about it apart from it’s not new.
    Reply
  • Hresna
    The article somewhat misrepresents the nature and character of undervolting.

    The vast majority of people doing this will achieve the same or better performance than stock, while also having less heat and fan noise. It is absolutely worth doing for anyone that can be bothered to try.

    The VF curve method in afterburner (on NVIDIA cards) is the time-honoured gold standard method for this… picking a voltage point in the 900mV area, raising the offset by +120 or so (some multiple of 15), and flattening out the curve to the right of that point.
    Reply
  • yzonker
    sizzling said:
    Regarding the memory point I read about this many gpu generations ago, I think it might have been when I was overclocking my old 780. I don’t know anything more about it apart from it’s not new.

    Yea I don't know when that started. I was just commenting on the article using a 3090. Better advice is probably to say, if you have any recent generation of Nvidia card, the procedure I mentioned needs to be used to really dial in the mem OC properly.

    The article does do a good job of illustrating how little there is to gain from a mem OC though, at least when the card is power limited. The mem OC eats in to the power budget and will reduce core clocks, reducing the performance gain from the mem OC.

    And to be fair, I think they probably backed off on the mem OC enough to not be in to regression (+1500 crashed, so they went down to +1000).
    Reply
  • Matt_ogu812
    I used the EVGA X1 to OC my RTX 3060(auto OC)and within a month the card started having a burning smell.
    EVGA warranty replaced it, 3-year warranty, but waiting 2-3 weeks for a replacement can be a bit much.
    Needless to say, I'm not going to bother with the 5-10% improvement and leave it stock.
    Maybe I got one of those defective GPUs that I read about and it was just all coincidental?
    Regardless no-mo running the replacement on the ragged edge.
    Reply