Your PC is bottlenecked if either your CPU or GPU sits at 99-100% usage while the other hangs below 70% during your actual game. The simplest test is a 10-minute gaming session with MSI Afterburner's on-screen display showing CPU and GPU usage side by side. Anything else is guesswork.

📊 The 70/99 Rule

Every modern gaming PC is bottlenecked somewhere, and that's fine. You want the GPU to be the limiter in AAA games at 1440p or 4K, because a GPU-limited system scales cleanly with settings changes. A CPU-limited system at 1080p esports titles is also fine for competitive play. The problem is when the wrong component limits at the wrong resolution.

GPU bottleneck (healthy for AAA)

GPU at 99-100%, CPU below 70%, FPS below your monitor's refresh rate. Lower graphics settings or DLSS/FSR will give you more frames. This is the correct place to be in Cyberpunk 2077, Alan Wake 2, or any 4K gaming scenario.

CPU bottleneck (can be a problem)

CPU at 99-100% (or one core pegged), GPU below 70%, GPU temp lower than expected. Dropping resolution won't help. This is common in CS2, Valorant, Escape from Tarkov, and simulation games.

🔧 How to Measure It in South Africa

Install MSI Afterburner and RivaTuner Statistics Server, enable the on-screen display with CPU usage per core, GPU usage, and VRAM. Load your most-played game, play for 10 minutes, and screenshot. Check Evetech's diagnostic tools page if you want a pre-configured profile. Use your normal settings, not benchmark presets, because bottlenecks change with resolution.

TIP

Don't trust single-number "bottleneck calculators" online. They ignore resolution, game type, and background processes. The only accurate measurement is on your rig, in your game, at your settings. Screenshot CPU per-core usage because hidden single-core bottlenecks are common in older DX11 titles. {{/TipBox}}

💡 Fixing the Right Bottleneck

If your GPU pegs at 99% in Hogwarts Legacy at 1440p, you need a faster GPU or lower settings, not a new CPU. If your CPU pegs at 99% in a flight sim while the GPU idles at 40%, a GPU upgrade is wasted spend and you need a faster CPU or more cache. For SA buyers on a fixed budget, balance matters more than any single component; a mid-range gaming PC with a Ryzen 5 7600 and an RX 7700 XT will feel better than a Ryzen 9 with a weak GPU.

Also watch VRAM. If you see 7.8GB used on an 8GB card at 1440p, frames will stutter regardless of GPU utilization. That's a VRAM bottleneck and it looks identical to a GPU bottleneck on paper.

🏁 Quick Self-Diagnosis

Run HWiNFO or Afterburner. Ten minutes of your actual game. Note the numbers. If GPU is at 99% you are GPU-limited. If CPU is at 99% you are CPU-limited. If both are below 95%, you have a software, power-plan, or driver issue and no hardware upgrade will fix it until you fix that first.

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