PC Bottleneck Calculator: Check CPU and GPU Balance

How to Read Your Result

The percent shows how much of the faster part's time goes to waiting. A 22% CPU bottleneck means the graphics card sits idle about 22% of the time, because the processor can't hand it frames any faster.

• Under 12%: well matched. One part always finishes a little first, so a small gap is normal.
• 12% to 24%: a small bottleneck. It shows up in benchmarks more than in play.
• 25% to 39%: a large bottleneck. You paid for speed that the slower part can't use.
• 40% and up: a severe bottleneck. The faster part waits almost half the time or more.

When the graphics card is the limit, the percent shows the processor's spare time instead. That is the healthy case for gaming, since the card you likely paid the most for is working flat out. For a quick tour of what each part does, see our parts of a computer guide.

For smoothness, a gap only costs you something when it holds the frame rate below your monitor's refresh rate. A 144 Hz screen shows at most 144 frames each second, so a processor that tops out at 160 FPS isn't holding you back on it. Find out what your screen can use with the refresh rate calculator.

Fast shooters like CS2 and Valorant are the exception. Frames past the refresh rate still trim input lag a little, and NVIDIA's latency guide notes that capping your frame rate adds slightly more lag than leaving it uncapped. Pick one of these games and the tool tells you when a faster part still helps.

Why Resolution Changes the Answer

The processor prepares each frame: game logic, physics, and the list of things to draw. That work stays about the same at any resolution. The graphics card's work grows with the pixel count, and 4K has four times the pixels of 1080p.

So a pair that is CPU limited at 1080p often turns GPU limited at 1440p or 4K. That's why the tool shows all three side by side. 1080p is still the most common gaming resolution in the Steam Hardware Survey, with 1440p in second place.

Check for a Bottleneck on Your Own PC

Watch your graphics card's usage while you play. TechSpot's testing guide says usage below about 95% likely means the processor is the limit. Check each CPU core too, because a game can max out a few cores while total CPU use looks low.

Intel's free PresentMon makes this clearer with its GPU Busy number. When each frame takes much longer than the GPU Busy time, the card is sitting idle and waiting on the CPU. Intel explains the pattern in its guide to CPU and GPU bound scenes.

For a quick test, drop the graphics preset one step. If your frame rate barely moves, the processor is the limit. If it stays low in every game, check for a frame cap, power setting, or heat first with these fixes for low FPS. Computer Info Bits PC Reporter can also check temperatures and drivers on Windows 11 before you blame the hardware.

Games That Lean on the Processor

Fast competitive games ask the processor for hundreds of frames each second. In the model, Baldur's Gate 3, Space Marine 2, Stalker 2, and Assassin's Creed Mirage lean hardest on the CPU. Pick one in the game list to check it alone.

Graphics-heavy games flip that around. Both ARK games, Final Fantasy XVI, and Black Myth: Wukong push almost any card to its limit first. The game breakdown under each result shows how your pair handles all 56 games.

Fixes That Cost Nothing

When the processor is the limit, give the graphics card more to do. Raise the preset or resolution and the frame rate barely changes. As TechSpot notes, lower settings and upscaling won't lift a processor limit, so closing background apps is the other free step.

When the graphics card is the limit, lower the preset or turn on upscaling. DLSS, FSR, and XeSS draw each frame at a smaller size and then enlarge it. The tool lists the changes worth making for your pair, with the frame rate each one gives.

Plan the Right Upgrade

Press Try it on any suggestion to swap that part into your result, then Back to my parts to return. Save Setup keeps a pair so you can compare it later.

A chip on the same socket can drop into your current board. Check the board maker's CPU support list first, since many need a BIOS update. A new platform also needs a new board and often new RAM, so plan the memory with our RAM calculator.

Graphics card picks go by speed, not price, so compare current prices before you buy. From 1440p up they skip 8 GB cards, since TechSpot's 1440p tests found the 16 GB RX 9060 XT up to twice as fast as the 8 GB model in games that fill its memory.

A faster graphics card may need a bigger power supply, so size it with the power supply calculator. Check that a pick fits your board, memory, and power supply with our upgrade checker. If heat is slowing your PC down, follow the PC airflow optimization guide before replacing hardware.

How This Calculator Works

The tool uses the same part scores and game factors as our FPS estimator. It works out how many frames the graphics card can draw and how many the processor can prepare. The lower number is your frame rate, and the gap between them is the bottleneck.

The scores follow published gaming results, such as the Tom's Hardware GPU hierarchy and its CPU rankings. Laptop chips assume a high power setting. NVIDIA's laptop GPU comparison shows how widely makers set those limits.

We test the processor side against 3,371 published results from eight outlets, such as TechSpot's Ryzen 7 9800X3D review and GamersNexus' Ryzen 5 5500X3D review. On reviews left out of the tuning, a typical estimate lands within about 13% of the measured frame rate. Test scenes explain much of that gap: in F1 24, a Ryzen 7 9800X3D ran 185 FPS in PC Games Hardware's test and 248 in Tom's Hardware's.

Graphics card scores are checked against about 2,400 results from TechPowerUp's card reviews and PC Games Hardware. The weakest spot is a top card at 1080p in a processor-heavy scene, where the tool may call the pair well matched when the processor is the real limit.

RAM and storage aren't part of the math. Too little memory, or a single stick, causes stutter that no score can show. Check a whole system against a game's needs with the game compatibility checker.

The tool covers gaming only. For streaming, the video encoder built into most graphics cards keeps that work off the processor, while NVIDIA's broadcasting guide notes that the x264 encoder uses the CPU instead.