Building or upgrading a gaming PC comes with a lot of guesswork will your CPU bottleneck your GPU? What FPS can you actually expect in your favorite game? Is your power supply enough? Should you upgrade now or wait?
CoreOptimize's free calculators answer all of these questions in seconds. Here's a complete guide to each tool, when to use it, and how to combine them for a smarter build.
- Bottleneck Calculator — Find Your Weakest Link
A bottleneck happens when one component (usually your CPU or GPU) holds back the rest of your system, capping your overall performance no matter how strong your other parts are.
The Bottleneck Calculator analyzes your CPU and GPU pairing at your chosen resolution and tells you:
Whether you're CPU-bound or GPU-bound
A bottleneck percentage so you know how severe the imbalance is
Whether RAM is also limiting performance
A recommended upgrade path to fix the imbalance
When to use it: Before buying a new GPU or CPU, or if you're seeing stutters and low FPS despite having decent hardware.
Pro tip: Bottlenecks change with resolution. A CPU that bottlenecks your GPU at 1080p might not bottleneck it at all at 4K, since the GPU becomes the limiting factor at higher resolutions.
- FPS Calculator — Estimate Real Gaming Performance
Specs on paper don't tell you how a game will actually run. The FPS Estimator predicts your expected frame rate based on:
Your CPU and GPU combination
Target resolution (1080p, 1440p, 4K, or ultrawide)
In-game quality settings
When to use it: Before buying a game-ready PC, or to set realistic expectations for a specific title before you upgrade.
Why it matters: Two PCs with the same GPU can perform very differently depending on the CPU, RAM speed, and even storage — the FPS Calculator factors in these variables instead of giving you a generic number.
- PSU Calculator Never Underpower Your Build
An undersized power supply can cause random shutdowns, instability under load, or long-term hardware damage and it's one of the most overlooked parts of a build. The PSU Calculator helps you:
Calculate total system wattage draw based on your components
Get a recommended PSU wattage with safe headroom
Check efficiency ratings (80+ Bronze, Gold, Platinum) so you're not overpaying or underpowering
When to use it: Before finalizing any build — this should be one of the last checks before you order parts.
Rule of thumb: Always leave at least 20% wattage headroom above your calculated draw. This protects against power spikes and gives you room to upgrade later without buying a new PSU.
- Upgrade Advisor Know What to Buy Next
Not sure whether to upgrade your GPU, add RAM, or replace your motherboard? The Upgrade Advisor checks your current setup for compatibility and performance gaps, including:
CPU socket and motherboard chipset compatibility
RAM type (DDR4 vs. DDR5) and capacity
Physical clearance and power requirements for new parts
When to use it: When you're planning an upgrade and want to avoid buying a part that doesn't fit or isn't compatible with what you already own.
How to Use All Four Tools Together
For the most accurate picture of your build, run the tools in this order:
Upgrade Advisor — confirm compatibility first, so you don't plan around parts that won't fit.
Bottleneck Calculator check CPU/GPU balance for your target resolution.
FPS Calculator see the real-world performance impact of that balance in the games you play.
PSU Calculator make sure your power supply can handle the final build safely.
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