Ryzen 7 7800X3D + 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 Ryzen 9 9900X (index 96.9), the weakest CPU closing at least half the index gap (~79.5% of it), and it fits your current AM5 socket. The full index match at 1080p — the weakest CPU whose gaming index meets this GPU's — is the Ryzen 7 9800X3D (index 100), on your current AM5 socket.

At 1440p, the GPU index is the larger of the two. The sensible CPU step is the Ryzen 9 9900X (index 96.9), the weakest CPU closing at least half the index gap (~79.5% of it), and it fits your current AM5 socket. The full index match at 1440p — the weakest CPU whose gaming index meets this GPU's — is the Ryzen 7 9800X3D (index 100), on your current AM5 socket.

At 4K, the GPU index is the larger of the two. The sensible CPU step is the Ryzen 9 9900X (index 96.9), the weakest CPU closing at least half the index gap (~79.5% of it), and it fits your current AM5 socket. The full index match at 4K — the weakest CPU whose gaming index meets this GPU's — is the Ryzen 7 9800X3D (index 100), on your current AM5 socket.

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 7800X3D — gaming index 84.9 (Ryzen 7 9800X3D = 100), AM5, peak boost power 162W. 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 0.85× the GPU index at 1080p and 0.85× 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 cPU index is 1.14× the GPU index. Calculate it
• With the one-tier-up CPU instead — Ryzen 5 9600X — at 1080p gPU index is 1.18× the CPU index. Calculate it
• With the one-tier-down CPU instead — Core Ultra 5 250K Plus — at 1080p gPU index is 1.2× 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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