It can be incredibly deflating to unbox your shiny new (or pre-owned) GPU, plug it in, install all the drivers, and fire a game up only to be disappointed by the level of performance. You even did the requisite research on the best GPU for your system. Perhaps there was a smudge on your glasses when you were reading those benchmark charts, but if you're sure you should be seeing more performance, it's likely to be one of these 4 issues.
8 misconceptions about PC performance debunked
Most of these are still more common than you'd think
4 Thermals
Most common reason for poor performance
GPUs require a lot of power, and with that power comes heat, like with any other PC component. GPUs keep themselves cool with their own dedicated cooling solutions, but that doesn't guarantee that they'll always run at optimal temperatures. Once you start getting to the high 80 or low 90 degrees Celcius range, you can start seeing some performance loss due to heat. For most fringe cases, this results in some slightly lower boost clocks, but at worst, you can see game crashes and intense thermal throttling, resulting in unplayable framerates.
Fixing an overheating GPU isn't trivial, but you can start by dusting the internals of your system. You shouldn't have to dust the card itself, being that it's new, but if you bought a pre-owned unit, give it a good dusting. Make sure that your card has access to fresh air, either from the front or bottom intake fan slots. If you've done all that and are still seeing high temperatures, as a last resort, you can take apart your card and replace the thermal paste, which should make a significant difference.
4 obvious signs your graphics card is overheating
You don't need monitoring software if you look for these signs
3 CPU bottlenecking
Not always obvious
Performance rarely comes down to individual components. In fact, for most workloads, it really is the sum of the parts of your build, but not all parts are created equal. Your CPU and GPU do most of the heavy lifting, and if one of these links is weak, the chain of performance will be as well.
Diagnosing a CPU bottleneck isn't as simple as looking at usage percentages. In Windows, CPU usage % is based on the amount of time your CPU is busy, but it's not a great representation of if you're being CPU limited in a game. The solution is to look at a metric like GPU busy, which is a common frame-level telemetry metric. This metric shows you how long your GPU is taking to render an image, and, in turn, how long it's waiting for your CPU to deliver the next frame. In cases where you're experiencing a CPU bottleneck, frametimes will be significantly longer than your GPU busy time. If you weren't CPU limited, frametime and GPU busy would be much more closely linked, showing that no part of your GPU is waiting to be fed by your CPU. There's no easy way to fix a CPU bottleneck besides upgrading to a more powerful CPU that can better match your GPU.
3 signs that your CPU is bottlenecking the GPU
A powerful GPU needs an equally capable CPU
2 PCIe version
A sneaky reason for poor performance
Whenever a new PCIe version comes around, it's often cited as being rather insignificant for most users, and while that's true in most cases, there is one specific case in which an older PCIe version can land your new GPU in poor performance land inexplicably. It comes down to VRAM and bandwidth.
When your GPU runs out of its dedicated memory buffer, it needs someplace else to store things. The first place it turns to is your system memory, which requires the data to travel across the PCIe bus to get to. This is fine when the workload or game in question has most assets loaded, and the frame buffer isn't overflowing exceedingly. But once your GPU is taking big chunks of shared memory, performance suffers heavily. This is incredibly common with 8 GB graphics cards today and is one of the primary reasons it's hard to recommend them, since AAA games use more VRAM than they ever have.
So how does the PCIe version fit into all of this? Well, since shared memory has to travel across the bus, if that PCIe bus is faster, you'll notice fewer performance hits when it has to dip into that memory. If you have a card with 10 GB or less of VRAM, the PCIe version of both your motherboard and GPU have a fairly significant say in performance. Anything under PCIe 5.0 is going to be noticeably worse than the newest version.
Your GPU's PCIe generation doesn't matter — except when it does
PCIe 3.0 doesn't affect your GPU performance, unless you run out of VRAM
1 Driver version
Not all driver versions are created equal
We hear it all the time: "update your drivers". It's good advice, especially if you're running into issues with newer titles or after a recent update to your favorite productivity suite. But honestly, it's not always a good idea to update your drivers. As we've seen historically from AMD, and more recently from Nvidia, new drivers ideally come with performance and stability benefits, but sometimes do the total opposite. This is totally dependent on the application, but some older drivers perform much better in some instances than newer drivers do. If you're having an issue with a specific game after a driver update, doing a quick search to see if others are experiencing the same thing is worth your time. Sometimes the best solution is to downgrade until the performance issues are fixed.
3 reasons why I stopped updating my Nvidia GPU drivers every release
Every Nvidia driver update seems like a risky affair
Diagnosing performance woes can be a drag
It sucks being disappointed by a new purchase, but sometimes it's as simple as a bad driver or another component letting you down. Upgrading your PC can be a tumultuous process, with the cost seemingly being driven up generation after generation. If you're looking to save a buck, buying pre-owned can absolutely be an avenue worth considering.