PC Bottleneck Checker

Check CPU and GPU compatibility for free. Calculate the bottleneck percentage from your combination and get advice on the best build.

1Choose a CPU

Select the CPU you use or plan to buy

2Choose a GPU

Select the GPU you use or plan to buy

Bottleneck

Guide: 10% or less = optimal / 25% or less = acceptable

Selected CPU

Selected GPU

CPU

GPU

Advice

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CPU Bottlenecks and AI Model Support by GPU

For models such as RTX 3060, GTX 1060, and RTX 4060, automatically check the top 10 compatible CPUs and CPU bottlenecks plus supported AI models such as Stable Diffusion, Flux, Llama, and Mistral from VRAM capacity.

RTX 5090 RTX 4090 RTX 3090 RTX 3080 Ti RTX 3070 Ti RTX 3060 Ti RTX 3080 RTX 3070 RTX 3060 RTX 4060 GTX 1070 GTX 1060

Browse All 176 GPU Models →

Combinations You Have Tried

Save diagnosed builds to your account and review them later.

AI PC Advisor

Ask about builds, upgrades, or recommendations for a specific use.
If you diagnose selected parts first, the advisor will use that context.

Hello! Ask anything about PC builds. For example: “Build a gaming PC for ¥150,000” or “How should I fix the bottleneck in my current build?”

FAQ | Bottleneck Diagnosis and CPU–GPU Compatibility

What is a bottleneck simulator? How is it different from a checker?

They are the same thing. A tool like this one, which calculates a bottleneck percentage from a chosen CPU and GPU, is searched for under several names, including "bottleneck checker," "bottleneck simulator," and "bottleneck calculator." Whichever name you used to find this page, it runs the same diagnosis.

What is a PC bottleneck?

A bottleneck occurs when either the CPU or GPU is too slow and limits the performance of the other part. For example, even a powerful GPU cannot raise frame rates beyond what a slow CPU can process. The balance of the combination matters more than either part alone.

How can I check CPU and GPU compatibility?

Choose your current or planned CPU and GPU on this page, then select Diagnose. The checker calculates a bottleneck percentage from their relative performance scores, identifies which part is limiting performance, and provides free suggestions.

What bottleneck percentage is ideal?

As a guideline, 10% or less is an optimal balance and 25% or less is generally acceptable in practice. Above 25%, one part leaves a substantial amount of the other part’s performance unused, so upgrading the limiting component may be worthwhile.

What is the difference between a CPU and GPU bottleneck?

A CPU bottleneck occurs when the CPU cannot process data quickly enough and the GPU must wait. It is common at lower resolutions and high frame rates. A GPU bottleneck means graphics performance is the limit and is more natural at high resolutions such as 4K. Acceptability depends on resolution and game type.

How does this bottleneck calculation work?

The checker uses benchmark-derived CPU and GPU performance scores and converts deviation from an ideal CPU:GPU ratio into a bottleneck percentage. The ideal ratio depends on resolution: about 0.9:1 at Full HD (1080p), 0.7:1 at WQHD (1440p), and 0.5:1 at 4K, because higher resolutions add GPU work per frame while CPU work stays about the same. Actual performance also depends on the game, memory, and other factors, so use it as a build-planning guide.

What happens when the CPU and GPU are a poor match?

When CPU and GPU performance are poorly balanced, the faster part cannot be used fully. A weak CPU can cap frame rates and cause stutter or low minimum fps; a weak GPU can limit resolution and graphics quality. Checking compatibility before buying helps prevent this wasted performance.

Can I check bottlenecks for a specific GPU model?

Yes. There are individual GPU pages for 176 models, including the RTX 3060, RTX 4090, and GTX 1060. Each page shows compatible CPUs, combinations likely to bottleneck, and supported local AI models. Choose your model from the GPU list below.

CPU Bottlenecks and AI Model Support by GPU

Combinations You Have Tried

AI PC Advisor

FAQ | Bottleneck Diagnosis and CPU–GPU Compatibility

Now that you know the PC that runs AI,learn by teaching that AI.

Now that you know the PC that runs AI,
learn by teaching that AI.