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Free CPU-GPU bottleneck calculator for gamers. Check compatibility, find bottlenecks, and get upgrade advice in seconds. No sign-up required.
Building or upgrading a gaming PC often leads to an frustrating experience: you spend $800 on a graphics card, but your games still stutter. Your FPS numbers look fine on paper, yet gameplay feels like wading through molasses. This gap between "specs look good" and "performance feels terrible" is almost always a bottleneck — and most gamers do not even know they have one until they have already wasted money on the wrong upgrade.
isitBOTTLENECKED is a free, browser-based CPU-GPU bottleneck calculator designed specifically for gamers. It analyzes your processor, graphics card, RAM, storage, and monitor resolution to determine how well your components work together. Unlike other bottleneck calculators that give you a single percentage and call it a day, this tool explains what that percentage means for your specific setup and provides actionable upgrade recommendations. You enter your specs, hit calculate, and receive a clear bottleneck percentage along with guidance on which component is holding your system back.
Comprehensive Bottleneck Analysis The calculator cross-references your CPU and GPU against a live database of real-world benchmark data from PassMark, UserBenchmark, and 3DMark stress tests. It considers not just raw performance scores but also your selected resolution and workload type, giving you results that match your actual gaming experience rather than theoretical capabilities.
Multi-Component Evaluation While competitors focus only on CPU versus GPU scores, isitBOTTLENECKED includes screen resolution, storage type, and RAM in its main calculation. This matters because a system with 8GB of RAM or a slow HDD will bottleneck differently than one with 32GB and an NVMe SSD, even with identical processors and graphics cards.
Honest Upgrade Guidance The tool does not push you to buy components through affiliate links. Instead, it offers recommendations backed by detailed analysis, explaining the pros and cons of each potential upgrade. If your PC has a bottleneck, the tool provides 19 methods to minimize or eliminate it without requiring you to spend money immediately.
Clear Result Interpretation Results are broken down into four severity levels: 0-10% is perfectly balanced, 10-20% is minimal and barely noticeable, 20-40% means you are leaving performance on the table, and 40%+ indicates a significant bottleneck where one component is dragging down your entire system. The tool also tells you whether you are CPU-bound or GPU-bound, which changes everything about what you should upgrade next.
Gaming-Specific Focus The calculator is optimized for popular titles like League of Legends, Fortnite, Cyberpunk, and Valorant. It accounts for how different games stress different components, so a build that works for one title may bottleneck badly in another.
Gamers Experiencing Performance Issues If your games stutter, drop frames at the worst moments, or feel choppy despite "good" FPS readings, this tool helps you identify whether your CPU or GPU is the culprit. You can then make an informed decision about which component to upgrade rather than guessing wrong and wasting money.
PC Builders Planning New Systems Before purchasing parts for a new gaming rig, you can test different CPU-GPU combinations to see how well they will work together. This prevents the common mistake of pairing a high-end GPU with an older, low-core-count processor that cannot keep up.
Budget-Conscious Users Evaluating Upgrades If you are wondering whether upgrading your graphics card will actually improve performance or whether your CPU is the real limitation, the calculator gives you a definitive answer so you can spend your upgrade budget on the right component.
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