PC bottleneck calculator

Free CPU + GPU bottleneck calculator. Compare UserBenchmark Average Bench scores at 1080p, 1440p, and 4K to see which component limits your build.

Your build

AMD Ryzen 7 7800X3D

8C / 16T · up to 5 GHz · 120 W · AM5 · 96 MB L3

AMD Radeon RX 9070 XT

16 GB GDDR6 · 256-bit · 4,096 shaders · PCIe 5.0 x16

Pick a title to judge balance for that game, or leave on Any game.

Typical presets

Scores from UserBenchmark. Specs shown for planning only.

CPU-limitedMild imbalance
AMD Ryzen 7 7800X3DAMD Radeon RX 9070 XT

Ryzen 7 7800X3D + RX 9070 XT

Mild CPU bottleneck at 1440p (~24% gap).

−100% CPU limitingBalanced+100% GPU limiting
-24%
−100%0%+100%

Bottleneck gap

~24%

Limiting side

CPU-limited

CPU index

100

UB 112%

GPU index

132

UB 132%

AMD Ryzen 7 7800X3D

CPU specs

Cores / threads
8 / 16
Clock (base / boost)
4.2 / 5 GHz
TDP
120 W
Socket
AM5 (LGA 1718)
L3 cache
96 MB
Architecture
Raphael (Zen 4)

Price comparison

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AMD Radeon RX 9070 XT

GPU specs

Memory
16 GB GDDR6
Bus width
256-bit
GPU clock
2970 MHz
Memory clock
2518 MHz
Shaders
4,096
Interface
PCIe 5.0 x16

Price comparison

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What this means

The GPU has headroom the CPU cannot feed for this workload. Upgrading the CPU — or moving to a higher resolution where the GPU works harder — will improve balance.

Performance across resolutions

A pair that looks CPU-limited at 1080p can flip toward GPU-limited at 4K. Tap a card to focus that resolution.

Popular pairings

Scores use UserBenchmark Average Bench (CPU vs i9-9900K ≈ 100%, GPU vs RTX 5070 ≈ 100%), then normalized and weighted by resolution and game factor. Estimates for planning — not a substitute for in-game utilization overlays.

A PC bottleneck calculator helps you check whether a planned CPU and GPU pairing is balanced for the resolution and game you actually play. Pick your parts above to see a clear verdict at 1080p, 1440p, and 4K — powered by 148+ CPU and 110+ GPU UserBenchmark Average Bench scores.

How it works

  1. 1. Choose CPUSearch your processor from 148+ parts.
  2. 2. Choose GPUMatch it with 110+ graphics cards.
  3. 3. Pick settingsSet resolution, game, and graphics level.
  4. 4. Get verdictSee the limiter, gap, and upgrade advice.

Plan smarter. Build better.

Check balance before you buy — 148+ CPUs and 110+ GPUs with clear CPU vs GPU direction at every resolution.

Optimal CPU and GPU pairings

An optimal pairing is one where neither the CPU nor the GPU sits idle for the resolution and graphics settings you care about. Perfect 50/50 balance is rare — and not required. Gaps under about 15% are usually fine; mild imbalance is common and often cheaper to live with than a full upgrade.

Resolution still decides the story. Competitive 1080p leans on the CPU.1440p is the sweet spot for most gaming PCs.4K shifts load onto the GPU, so a pair that looks CPU-limited at 1080p can read as balanced — or GPU-limited — at 4K. Use the calculator above with your real game and graphics preset, then treat these lists as starting points.

Well matched at 1440p

These popular builds stay close at 1440p on Medium graphics — the resolution most people build for.

Strong 1080p pairings

High-FPS and esports-leaning builds where the CPU keeps up at 1080p. Drop graphics toward Low if you chase frame rate.

Balanced toward 4K

Pairs that hold together when the GPU does most of the work. Raise graphics toward High or Ultra only if the calculator still looks balanced for your title.

Every link opens a dedicated bottleneck page for that CPU + GPU combo so you can compare 1080p, 1440p, and 4K side by side before you buy.

Popular bottleneck tests

Methodology

UserBenchmark publishes separate Average Bench scales for CPUs and GPUs. We normalize each score against calibration anchors (112% CPU / 100% GPU), then weight the comparison by resolution (more CPU-sensitive at 1080p, more GPU-sensitive at 4K), graphics preset, and a game factor for popular titles — CS2 and Valorant lean CPU-heavy; Cyberpunk and Alan Wake 2 lean GPU / cinematic. The gap is reported as a rounded range with a limiter direction — not a fake-precise single percentage.

UserBenchmark is one public crowd-sourced dataset and has known community criticism (especially around AMD scoring). We disclose the source so you can judge the estimate. For confirmation before buying, monitor utilization in the games you play.

FAQ

What is a PC bottleneck?

When one component limits the rest of your system. If the GPU finishes frames while waiting on the CPU — or the CPU waits on the GPU — the slower side sets your FPS ceiling.

What makes an optimal CPU and GPU pairing?

One that stays within a small capability gap for your resolution and graphics settings. Build for the monitor you own: a 1080p competitive setup wants a stronger CPU relative to the GPU; a 4K Ultra build wants the opposite. Use the lists above as candidates, then confirm with the calculator.

Is a small bottleneck bad?

Gaps under ~15% are usually fine. Mild imbalance (about 15–30%) is common and often not worth a full upgrade. Above ~30%, the weaker side is more likely to cost meaningful frames for that resolution.

Can RAM cause a bottleneck?

Yes — capacity, speed, and single-channel setups can limit both CPU and GPU, especially in CPU-heavy titles. This tool focuses on CPU vs GPU balance; check RAM separately if utilization looks wrong.

Browse more free tools in the gaming tools hub, or open a direct pairing page such as Ryzen 7 7800X3D + RX 9070 XT.