Is Your CPU Bottlenecking Your GPU?
Find out in seconds. Select your CPU and GPU, choose your use case, and get an instant bottleneck percentage with specific upgrade recommendations.
How the Calculator Works
Three steps to a precise bottleneck analysis — no guesswork, no generic percentages.
Select your CPU & GPU
Choose from our database of Intel and AMD CPUs, and NVIDIA and AMD GPUs. Use the search to find your exact model.
Pick your use case
Tell us what you use your PC for — gaming at 1080p, 1440p, 4K, streaming, video editing, or general use.
Get instant analysis
Our engine calculates a bottleneck percentage, identifies which component is limiting performance, and tells you what to do about it.
Why Builders Trust This Tool
Built for accuracy. Designed for speed. Free forever.
Instant Results
Get your bottleneck percentage in under a second. No loading screens, no waiting. The entire calculation runs locally in your browser.
Use-Case Weighted
Unlike simple ratio calculators, we weight results based on your actual use case. 4K gaming weights the GPU at 80%, 1080p drops it to 55%.
Privacy First
We never store your selections. No accounts, no tracking, no data sold. Your build stays in your browser.
Upgrade Guidance
Not just a number — we tell you which component to upgrade first and why, based on your specific pairing and use case.
Popular Build Combinations
Click any build to see the full bottleneck analysis
What Is a PC Bottleneck?
A PC bottleneck occurs when one hardware component performs significantly slower than another, limiting the overall system performance. The most common scenario in gaming is a CPU bottleneck — where the processor cannot prepare game data fast enough for the GPU to render, causing the graphics card to sit idle and wait.
This results in lower framerates than your GPU is capable of producing, even when your GPU usage appears low. You're leaving expensive GPU performance on the table because your CPU can't keep up.
Resolution Changes Everything
At 1080p, each frame requires less GPU computation, so the CPU needs to deliver frames faster — making CPU performance relatively more important. A budget CPU paired with a flagship GPU will struggle here.
At 4K, each frame requires the GPU to process 8× more pixels than 1080p. The GPU becomes saturated with work, and even a mid-range CPU will rarely bottleneck a high-end GPU. This is why our calculator uses resolution-specific weights.
Bottleneck Severity Scale
0–5%
No Bottleneck
Perfect balance
6–20%
Minor
Barely noticeable
21–40%
Moderate
Noticeable impact
41–60%
Significant
Major performance loss
61%+
Severe
Upgrade urgently
Frequently Asked Questions
View all FAQs →What is a PC bottleneck?
A bottleneck occurs when one component limits the performance of another. Most commonly, a slow CPU prevents a powerful GPU from rendering as many frames as it could, leaving expensive GPU performance unused.
Is a 10% bottleneck bad?
A 0–10% bottleneck is considered excellent and is practically unnoticeable in gaming. 10–20% is acceptable. Above 30% starts to impact measurable performance.
Why is 100% GPU usage not a bottleneck?
100% GPU usage is actually ideal — it means your GPU is fully loaded. A CPU bottleneck shows as GPU usage dropping below 90% while your CPU runs at 100%.
Does RAM affect bottlenecking?
Yes. Running 8GB in modern games can create a RAM bottleneck independent of CPU/GPU. 16GB dual-channel is the current gaming minimum; 32GB is future-proof.
How accurate is this bottleneck calculator?
Our calculator uses real-world benchmark data across millions of test runs. We normalize scores based on specific use cases (1080p gaming vs 4K gaming vs video editing) to provide an accurate estimate. However, specific game engines will always vary.
Does screen resolution matter?
Absolutely. At 1080p, the CPU has to work much harder to keep up with the GPU (CPU bottleneck). At 4K, the GPU is under massive load and the CPU matters far less (GPU bottleneck). Always calculate for your target monitor resolution.
Should I upgrade my CPU or GPU first?
If your CPU bottleneck is above 20%, upgrading the CPU will provide smoother gameplay (fewer stutters). If your GPU bottleneck is high, upgrading the GPU will increase your average FPS and allow for higher graphics settings.
What about thermal throttling?
If your CPU or GPU gets too hot, it will slow itself down to prevent damage. This creates a temporary bottleneck. You can simulate this in our calculator by enabling the "Thermal Throttling" advanced option.
Hardware Rankings
Comprehensive component database overview
Top CPUs for Gaming
Best processors ranked by gaming performance.
| Rank | Name | Score |
|---|---|---|
| 1 | Intel Core i9-14900KS | 133.0 |
| 2 | Intel Core i9-14900KF | 131.0 |
| 3 | Intel Core i9-14900K | 131.0 |
| 4 | Intel Core i9-13900KS | 131.0 |
| 5 | Intel Core i7-14700KF | 130.0 |
| 6 | Intel Core i7-14700K | 130.0 |
| 7 | AMD Ryzen 9 9950X3D2 | 129.0 |
| 8 | Intel Core i9-13900KF | 129.0 |
| 9 | Intel Core i9-13900K | 129.0 |
| 10 | AMD Ryzen 7 9800X3D | 128.0 |
Top GPUs by FPS
Graphics cards ranked by overall performance.
| Rank | Name | Score |
|---|---|---|
| 1 | Nvidia RTX 5090 | 183.0 |
| 2 | Asus RTX 5090 32GB ROG Astral | 183.0 |
| 3 | MSI RTX 5090 32GB Ventus 3X OC | 183.0 |
| 4 | Gigabyte RTX 5090 32GB Aorus Master | 183.0 |
| 5 | Nvidia RTX 4090 | 155.0 |
| 6 | Gigabyte RTX 4090 24GB Gaming OC | 155.0 |
| 7 | Asus RTX 4090 24GB TUF Gaming OC | 155.0 |
| 8 | MSI RTX 4090 24GB Gaming X Trio | 155.0 |
| 9 | MSI RTX 4090 24GB Suprim Liquid X | 155.0 |
| 10 | MSI RTX 4090 24GB Suprim X | 155.0 |
Top RAM Rankings
Fastest memory kits for gaming.
Top SSD Rankings
Fastest storage drives for load times.
| Rank | Name | Score |
|---|---|---|
| 1 | WD Black SN8100 M.2 4TB | 716.0 |
| 2 | WD Black SN8100 M.2 2TB | 683.0 |
| 3 | Crucial T705 M.2 4TB | 673.0 |
| 4 | Crucial T700 M.2 4TB | 637.0 |
| 5 | Samsung 9100 Pro M.2 2TB | 632.0 |
| 6 | Samsung 9100 Pro M.2 4TB | 631.0 |
| 7 | Lexar NM1090 Pro M.2 4TB | 609.0 |
| 8 | Crucial T705 M.2 2TB | 607.0 |
| 9 | WD Black SN8100 M.2 1TB | 601.0 |
| 10 | Crucial T710 M.2 4TB | 595.0 |