Ryzen 7 7800X3D + RTX 4090 bottleneck calculator

Check whether AMD Ryzen 7 7800X3D or NVIDIA GeForce RTX 4090 limits FPS at 1080p, 1440p, and 4K. UserBenchmark-powered bottleneck estimate with a clear upgrade direction.

Your build

AMD Ryzen 7 7800X3D

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

NVIDIA GeForce RTX 4090

24 GB GDDR6X · 384-bit · 16,384 shaders · PCIe 4.0 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-limitedMeaningful imbalance
AMD Ryzen 7 7800X3DNVIDIA GeForce RTX 4090

Ryzen 7 7800X3D + RTX 4090

Meaningful CPU bottleneck at 1440p (~35% gap).

−100% CPU limitingBalanced+100% GPU limiting
-35%
−100%0%+100%

Bottleneck gap

~36%

Limiting side

CPU-limited

CPU index

100

UB 112%

GPU index

155

UB 155%

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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NVIDIA GeForce RTX 4090

GPU specs

Memory
24 GB GDDR6X
Bus width
384-bit
GPU clock
2520 MHz
Memory clock
1313 MHz
Shaders
16,384
Interface
PCIe 4.0 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.

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.

Comparing AMD Ryzen 7 7800X3D (UserBenchmark Average Bench 112%) with NVIDIA GeForce RTX 4090 (155%). At 1440p, this pairing reads as cpu-limited with roughly a 36% capability gap.

Results by resolution

ResolutionVerdictGap
1080pCPU-limited~45%
1440pCPU-limited~36%
4KBalanced~10%

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.

Scores used

  • CPU: AMD Ryzen 7 7800X3D — 112%
  • GPU: NVIDIA GeForce RTX 4090 — 155%
  • Calibration anchors: CPU 112% · GPU 100%

Related pairings

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