Will the Core i9-14900K bottleneck the RTX 4090?

No. At 1440p the RTX 4090 is the limiting part, which is the normal state for a gaming PC. The Core i9-14900K has headroom to spare.

What power supply do I need for a Core i9-14900K and RTX 4090?

Estimated system load is about 803 W. A quality 1200 W unit leaves roughly 30% headroom for transient spikes.

Is this pair better at 1080p or 4K?

1080p: CPU-limited 9% (balanced). 1440p: CPU-limited 2% (balanced). 4K: GPU-limited 18% (balanced).

PCPairs

Core i9-14900K + RTX 4090: bottleneck check

Evenly matched at 1440p.

CPU GPU

Neither part waits on the other at 1440p. This is as balanced as a pairing gets.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	CPU	9%	balanced
1440p	CPU	2%	balanced
4K	GPU	18%	balanced

This is the classic pattern: at 1080p the Core i9-14900K is the limit (9%), while at 4K the RTX 4090 takes over (18% GPU-limited). If you play at 1080p on a high-refresh monitor, a faster CPU is the upgrade that matters; at 1440p or 4K this pair is already well matched.

Specifications

Intel Core i9-14900K
Cores / threads	24 / 32
Max boost	6.0 GHz
Socket	LGA1700
Max turbo power	253 W
Released	2023
Gaming index	87 / 100
Multi-core index	95 / 100

NVIDIA GeForce RTX 4090
VRAM	24 GB
Board power	450 W
Released	2022
1080p index	84.5 / 100
1440p index	82 / 100
4K index	79.6 / 100

Power supply

CPU 253 W + GPU 450 W + about 100 W for motherboard, memory, storage and fans gives an estimated peak load of 803 W. We recommend a 1200 W unit (80 Plus Gold or better) so transient spikes from the graphics card stay inside the PSU's comfort zone. Try other pairs in the PSU calculator.

Best CPU for the RTX 4090 Best GPU for the Core i9-14900K RTX 4090 PSU requirements

Compare nearby pairs

Same CPU, other GPUs

Same GPU, other CPUs

Indexes are relative estimates aggregated from published reviews; real results vary by game, settings, memory speed and drivers. Methodology.