How Our Bottleneck Calculator Works
We believe transparency builds trust. This page explains exactly how we calculate bottleneck percentages, where our benchmark data comes from, and what our tool can and cannot tell you.
Data Sources
Our hardware performance scores are normalised composites derived from the following benchmark sources:
Large-scale real-world GPU performance database. Primary source for GPU scores.
Standardized DirectX 12 and ray tracing GPU benchmarks.
Multi-threaded and single-threaded CPU performance scores. Primary source for CPU scores.
Specifications, TDP, memory bandwidth, and architectural data.
Cross-validated gaming FPS benchmarks for score calibration.
How We Calculate Bottleneck Percentage
Our bottleneck calculation uses a normalised performance ratio model:
The resolution multipliers represent the shift in computational demand at each resolution. At 4K, the GPU processes 4× more pixels than at 1080p — this is why higher resolutions reduce CPU bottleneck and increase GPU utilisation. This model is validated against real-world MSI Afterburner monitoring data across multiple game titles.
Score Normalisation
Raw benchmark scores from different sources use different scales and methodologies. We normalise all scores to a common internal scale using the following process:
- Collect benchmark scores from all sources listed above
- Apply a cross-validation coefficient to align scores across databases
- Weight gaming-specific benchmarks more heavily than synthetic benchmarks (60/40 split)
- Apply architecture-specific corrections for known outliers (e.g. 3D V-Cache CPUs in gaming)
- Validate final scores against published game-specific FPS benchmarks from Hardware Unboxed and Gamers Nexus
Accuracy & Limitations
We are transparent about what our calculator can and cannot do:
Our model uses average gaming workload data. CS2 is far more CPU-intensive than Cyberpunk 2077 at 4K. A single bottleneck percentage cannot capture this variance. For specific game estimates, check our FPS calculator.
GPU and CPU driver updates can change performance by 5–15%. Our scores reflect the latest available driver data at time of update.
RAM speed (XMP/EXPO) affects CPU-side performance by 5–20% on AMD platforms. The main calculator uses typical gaming RAM assumptions. Enable XMP/EXPO for best real-world results.
Unlike most calculators, we provide separate bottleneck percentages for 1080p, 1440p, and 4K — because resolution fundamentally changes which component is the bottleneck.
Our bottleneck percentages are typically within ±8–12% of real-world MSI Afterburner measurements in multi-title testing. This is sufficient for purchase planning decisions.
Data Update Schedule
| Update Type | Frequency |
|---|---|
| New GPU launches | Within 2 weeks of release |
| New CPU launches | Within 2 weeks of release |
| Score recalibration | Quarterly |
| FPS estimate data | Monthly |
| Full methodology review | Annually |
How to Verify Our Results
We actively recommend verifying our calculator results with real-world monitoring:
- Download MSI Afterburner + RivaTuner Statistics Server (both free)
- Enable GPU Usage % and CPU Usage % in Afterburner Monitoring settings
- Turn on On-Screen Display for both metrics
- Play your game for 10 minutes in a demanding scene
- Compare your measured GPU% and CPU% to our bottleneck analysis
Our recommendation: Use our calculator for pre-purchase planning, then verify with MSI Afterburner once hardware is installed. The two methods together give you the most complete picture of your system's performance.