Ryzen 5 3600 + GeForce RTX 5090: the index comparison

Short answer, by resolution — computed from the same index as our live calculator:

At 1080p, the GPU index is the larger of the two. The sensible CPU step is the Core Ultra 5 225 (index 72.1), the weakest CPU closing at least half the index gap (~50.3% of it) — on a different socket (LGA1851), so it also needs a new motherboard. The full index match at 1080p — the weakest CPU whose gaming index meets this GPU's — is the Ryzen 7 9800X3D (index 100), on a different socket (AM5).

At 1440p, the GPU index is the larger of the two. The sensible CPU step is the Core Ultra 5 225 (index 72.1), the weakest CPU closing at least half the index gap (~50.3% of it) — on a different socket (LGA1851), so it also needs a new motherboard. The full index match at 1440p — the weakest CPU whose gaming index meets this GPU's — is the Ryzen 7 9800X3D (index 100), on a different socket (AM5).

At 4K, the GPU index is the larger of the two. The sensible CPU step is the Core Ultra 5 225 (index 72.1), the weakest CPU closing at least half the index gap (~50.3% of it) — on a different socket (LGA1851), so it also needs a new motherboard. The full index match at 4K — the weakest CPU whose gaming index meets this GPU's — is the Ryzen 7 9800X3D (index 100), on a different socket (AM5).

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 5 3600 — gaming index 43.9 (Ryzen 7 9800X3D = 100), AM4, peak boost power 88W. Data provenance: Our own spec-derived index. own index

GeForce RTX 5090 — performance index by resolution: 100 at 1080p, 100 at 1440p, 100 at 4K (fastest card = 100 at each). Board power 575W. 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 0.44× the GPU index at 1080p and 0.44× at 4K. Raising the resolution does not change which side of this pairing carries the larger index.

Nearest alternative pairings

• With the one-tier-down GPU instead — GeForce RTX 4090 — at 1080p gPU index is 1.69× the CPU index. Calculate it
• With the one-tier-up CPU instead — Core i5 11400F — at 1080p gPU index is 1.89× the CPU 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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