CPU-bound games: why the GPU idles, which games do it and what actually helps
A game is CPU-bound when the processor cannot prepare frames as fast as the GPU could render them: GPU utilisation drops below 80–90 %, and lowering graphics settings or resolution does not raise FPS. It is typical at 1080p with a strong GPU, in simulation and strategy games, in open worlds with many NPCs, and in esports titles at 300+ FPS.
CPU limited · CPU bottleneck · processor limited
Key figures
From the FPSHQ database, as of Oct 15, 2026
What the CPU does every frame
Game logic, AI, physics, animation, audio, networking and — crucially — the preparation of GPU commands (draw calls) through the graphics API and driver. Many of these run on one or two main threads, so a CPU with high single-thread performance and large cache matters more than core count. DirectX 12 and Vulkan spread draw-call submission over more threads, but game logic is still often serial.
As FPS rises, the per-frame CPU budget shrinks: at 240 FPS the CPU has about 4 ms for everything, which is why competitive games are CPU-limited on nearly any GPU.
Games that are usually CPU-bound
FPSHQ's model estimates the CPU-limited FPS per game from measured runs with different CPUs; the share of measured combinations that are CPU-limited at 1080p is shown in the figures.
| Genre / examples | Why |
|---|---|
| Simulation: MS Flight Simulator, Cities: Skylines II, Factorio late game | simulation of thousands of agents/objects |
| Strategy: Total War, Stellaris, Civilization late turns | AI and unit counts |
| Open world with crowds: Spider-Man 2, Hogwarts Legacy, Dragon's Dogma 2, Starfield cities | NPC AI, streaming, draw calls |
| Esports at high FPS: CS2, Valorant, Fortnite competitive | tiny per-frame budget |
| Older engines: Unity single-thread, early UE4 | main-thread bound |
What helps and what does not
Use the bottleneck calculator to see for a specific game whether a CPU upgrade or a GPU upgrade raises your FPS.
- Helps: faster single-thread CPU, 3D V-Cache, faster RAM with tuned timings, lower draw distance/crowd/physics settings, frame generation
- Does not help: a faster GPU, DLSS/FSR upscaling, lower resolution, lower texture/shadow quality (mostly)
- Side effect: raising resolution or enabling ray tracing is "free" until the GPU becomes the limit
CPU vs GPU balance
Two sliders — GPU potential and CPU limit. The final FPS never exceeds the weakest link.
Unified FPSHQ model estimate, not a measurement.
On your PC
Enter your GPU (and CPU) — we calculate the effect of "CPU-bound" with the unified FPSHQ model using Cyberpunk 2077 as the example.
Save your PC in the account · Detect hardware with the app · Unified FPSHQ model estimate, not a measurement.
Where to use this on FPSHQ
Forum discussions
What is CPU-bound?
A game is CPU-bound when the processor cannot prepare frames as fast as the GPU could render them: GPU utilisation drops below 80–90 %, and lowering graphics settings or resolution does not raise FPS. It is typical at 1080p with a strong GPU, in simulation and strategy games, in open worlds with many NPCs, and in esports titles at 300+ FPS.
- independent FPS measurements
- 106
- rows of aggregated review data
- 4,800
- GPU + game pairs with measurements or aggregated data
- 967
- 1% low vs average (measured)
- 78%
FAQ
Why is my GPU usage only 60 %?
Does DLSS help when CPU-bound?
Do more cores fix a CPU bottleneck?
Why are esports games CPU-bound on any GPU?
Sources
FPSHQ Team · methodology · methodology · Updated
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