Bought a new GPU but FPS didn't increase as much as you expected? Or the opposite — you have a powerful GPU but some games still stutter? The problem is probably a "bottleneck" — one component in your system holding back another. This guide shows you how to tell which part is actually slowing you down.
What exactly is a bottleneck?
Running a game is a constant collaboration between the CPU and GPU: the CPU processes game logic (AI, physics, player input) and tells the GPU what to draw; the GPU then turns those instructions into an image. If one is much slower than the other, the faster component keeps "waiting" on the slower one — and that waiting means potential FPS goes unused.
Signs of a GPU bottleneck
- GPU usage stays consistently near 95-100% during gameplay.
- CPU usage is noticeably lower (e.g. 40-60%).
- Lowering resolution significantly increases FPS (less work for the GPU).
- Lowering graphics settings significantly increases FPS.
In this scenario, the GPU is the limiting component in your system — this isn't actually "bad," it's ideal for most gamers, since it means you're using your GPU at full capacity.
Signs of a CPU bottleneck
- GPU usage never reaches 100%, hovering around 60-80% instead.
- CPU usage (especially a single core) stays consistently high.
- Lowering resolution barely changes FPS at all (because the problem isn't the GPU's rendering workload).
- Lowering graphics settings doesn't change FPS much.
- FPS drops are especially noticeable in crowded scenes (many NPCs, explosion effects, lots of units in strategy games).
This means the CPU can't "feed" the GPU fast enough — upgrading the GPU without upgrading the CPU won't gain much FPS in this scenario.
How do you actually test for it?
- Use MSI Afterburner, the NVIDIA App overlay, or Windows Task Manager's Performance tab to watch both GPU and CPU usage simultaneously during gameplay.
- Compare the pattern you see against the lists above.
- If you're still unsure, drop resolution by one step (e.g. 1440p to 1080p) and observe how much FPS changes — a big increase points to a GPU bottleneck, little to no change points to a CPU bottleneck.
Some bottleneck is always normal
A perfect balance (100% GPU + 100% CPU usage simultaneously) almost never happens, and that's fine. What actually matters is which component hits its limit significantly before the other — small gaps (e.g. 90% GPU / 75% CPU) generally aren't worth worrying about.
Which upgrade makes sense in which case?
| Symptom | Priority |
|---|---|
| GPU consistently 95%+, CPU low | A GPU upgrade makes sense |
| GPU never hits 100%, CPU high | A CPU upgrade makes sense |
| Both high/balanced | Your system is well-balanced — no real issue |
Test your combo before upgrading
Before spending money on a new GPU or CPU, compare how much FPS different hardware combinations would give you in the games you play using our calculator — this helps you understand which component is actually holding you back (and therefore which one is worth upgrading). To directly compare two specific parts, you can also use our comparison page.
Frequently Asked Questions
Is a slight bottleneck normal?
Yes — gaps of 10-15% between GPU and CPU usage show up on almost every system and aren't worth worrying about. What actually matters is when the gap is very large (e.g. 95% vs. 50%).
Do I need special software to test for a bottleneck?
No, Windows Task Manager's Performance tab is enough for most users. If you want more detailed monitoring, free tools like MSI Afterburner also offer an in-game overlay.
Is upgrading the GPU useless on a CPU-bottlenecked system?
Not entirely useless — it can still provide a small gain in some games and especially at higher resolutions, but you won't get the full value of the upgrade without also addressing the CPU.