Ryzen 7 5800X3D + GeForce RTX 5080: the index comparison
Short answer, by resolution — computed from the same index as our live calculator:
| Resolution | CPU index | GPU index | Index ratio |
|---|---|---|---|
| 1920 × 1080 — 1080p | 67.6 | 53.6 | CPU index is 1.26× the GPU index |
| 2560 × 1440 — 1440p | 67.6 | 53.4 | CPU index is 1.27× the GPU index |
| 3840 × 2160 — 4K | 67.6 | 53.1 | CPU index is 1.27× the GPU index |
At 1080p, the CPU index is the larger of the two — the normal shape of a gaming build, where the graphics card sets the pace. No CPU upgrade is indicated by the index. The full index match at 1080p — the weakest card whose index meets this CPU's — is the GeForce RTX 4090; that is a mathematical target, usually more card than the build needs.
At 1440p, the CPU index is the larger of the two — the normal shape of a gaming build, where the graphics card sets the pace. No CPU upgrade is indicated by the index. The full index match at 1440p — the weakest card whose index meets this CPU's — is the GeForce RTX 4090; that is a mathematical target, usually more card than the build needs.
At 4K, the CPU index is the larger of the two — the normal shape of a gaming build, where the graphics card sets the pace. No CPU upgrade is indicated by the index. The full index match at 4K — the weakest card whose index meets this CPU's — is the GeForce RTX 4090; that is a mathematical target, usually more card than the build needs.
How to read the upgrade lines: the sensible step is chosen on performance only — price and value are not considered (we hold no price data).
The parts
Ryzen 7 5800X3D — gaming index 67.6 (Ryzen 7 9800X3D = 100), AM4, peak boost power 142W. Data provenance: Our own spec-derived index. own index
GeForce RTX 5080 — performance index by resolution: 53.6 at 1080p, 53.4 at 1440p, 53.1 at 4K (fastest card = 100 at each). Board power 360W. Data provenance: Our own spec-derived index. own index
How the index gap shifts
The index relationship barely changes with resolution: the CPU index is 1.26× the GPU index at 1080p and 1.27× at 4K. Raising the resolution does not change which side of this pairing carries the larger index.
Nearest alternative pairings
- With the one-tier-up GPU instead — GeForce RTX 4090 — at 1080p gPU index is 1.1× the CPU index. Calculate it
- With the one-tier-down GPU instead — GeForce RTX 4080 Super — at 1080p cPU index is 1.42× the GPU index. Calculate it
- With the one-tier-up CPU instead — Core i7 12700K — at 1080p cPU index is 1.29× the GPU index. Calculate it
- With the one-tier-down CPU instead — Core i5 12600K — at 1080p cPU index is 1.22× the GPU index. Calculate it
How this comparison is calculated
Both indices are ours, derived from manufacturer specifications only — no licensed benchmark tables. The CPU index scores gaming-relevant specifications on one scale; the GPU index does the same per resolution. We also built a bottleneck verdict model on top of these indices (a balance curve fitted to the pairings game publishers publish in their own system requirements) and ran it through a pre-registered validation in November 2026; it did not pass, so this site publishes the index comparison and not the verdict. The full method and the validation results are on the methodology page. Your real-world limit will vary by game, settings, driver and RAM.
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