Core i9-12900K + RTX 4080 in Starfield

Every figure below is a measurement aggregated from published review charts — the CPU's frame-rate ceiling and the GPU's frame-rate ceiling in this game, combined. Settings: Ultra preset, native rendering, no upscaling, no frame generation. CPU ceiling measured at 1080p, Low preset (reviewers' CPU-isolation method), flagship GPU.

1080p72–118 fps · Mild GPU limit 1440p59–99 fps · Mild GPU limit 4K40–68 fps · Strong GPU limit

1080p

Mild GPU limit

Expected frame rate: 72–118 fps (measured range across sources).

CPU Core i9-12900Kceiling ~118 fps on its own

GPU RTX 4080ceiling ~72–119 fps on its own

The GPU side is lower by about 19.1%: the pair runs at the lower ceiling, and upgrading the other part alone would not raise it.

That range suits a 60 Hz monitor; a high-refresh panel would be underused in this game.

Confidence: LOW — based on 3 source measurements for these two parts.

1440p

Mild GPU limit

Expected frame rate: 59–99 fps (measured range across sources).

CPU Core i9-12900Kceiling ~118 fps on its own

GPU RTX 4080ceiling ~59–99 fps on its own

The GPU side is lower by about 33.0%: the pair runs at the lower ceiling, and upgrading the other part alone would not raise it.

That range suits a 60 Hz monitor; a high-refresh panel would be underused in this game.

Confidence: LOW — based on 3 source measurements for these two parts.

4K

Strong GPU limit

Expected frame rate: 40–68 fps (measured range across sources).

CPU Core i9-12900Kceiling ~118 fps on its own

GPU RTX 4080ceiling ~40–68 fps on its own

The GPU side is lower by about 54.3%: the pair runs at the lower ceiling, and upgrading the other part alone would not raise it.

That range sits under a smooth 60 in this game at the tested preset — expect to trade settings for frame rate.

Confidence: MEDIUM — based on 3 source measurements for these two parts.

GPUs measured in this game at 1440p that clear this CPU:

RTX 5090 — ceiling ~134 fps (smallest step that removes the limit) · full result

This pair in other measured games

Alan Wake 2 — this pair is not both measured there yet.
Baldur's Gate 3 — this pair is not both measured there yet.
Counter-Strike 2 — this pair is not both measured there yet.
Cyberpunk 2077 — this pair is not both measured there yet.
Elden Ring — Mild CPU limit, 147–147 fps at 1440p
Kingdom Come: Deliverance II — this pair is not both measured there yet.
Marvel's Spider-Man 2 — this pair is not both measured there yet.
S.T.A.L.K.E.R. 2 — this pair is not both measured there yet.

Sources for Starfield

Full data: Starfield benchmarks · how verdicts are computed.