Will the Core i9-12900K bottleneck the RTX 4080 Super?

Only slightly: at 1440p the model puts the Core i9-12900K about 1% short of keeping the RTX 4080 Super fully fed, which is within the balanced band. The gap grows at 1080p and closes at 4K. This is a model estimate from performance indexes, not a measured FPS loss.

What power supply do I need for a Core i9-12900K and RTX 4080 Super?

Sustained gaming load is about 618 W using the RTX 4080 Super's measured draw. A 850 W unit is the safe choice.

Is this pair better at 1080p or 4K?

1080p: CPU-limited 8% (balanced). 1440p: CPU-limited 1% (balanced). 4K: GPU-limited 21% (GPU-bound (normal)).

Core i9-12900K + RTX 4080 Super: 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	8%	balanced
1440p	CPU	1%	balanced
4K	GPU	21%	GPU-bound (normal)

This is the classic pattern: at 1080p the Core i9-12900K is the limit (8%), while at 4K the RTX 4080 Super takes over (21% 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 i9-12900K
Cores / threads	16 / 24
Max boost	5.2 GHz
Socket	LGA1700
Maximum turbo power (MTP)	241 W Intel's published maximum sustained turbo power, above its base power; the PSU estimate uses it, so it errs high · Intel ARK
Released	2021
Gaming index	78 / 100
Multi-core index	80 / 100

NVIDIA GeForce RTX 4080 Super
VRAM	16 GB
Board power	320 W
Released	2024
1080p index	68.4 / 100
1440p index	64 / 100
4K index	59.9 / 100

Power supply

The RTX 4080 Super measured 302 W average while gaming (341 W highest 20 ms spike, TechPowerUp). With the Core i9-12900K at its maximum turbo power of 241 W and about 75 W for the rest of the system, the sustained load is about 618 W. A 850 W unit is the safe choice. Details on the RTX 4080 Super PSU page or try other pairs in the PSU calculator.

Upgrade paths

CPUs that remove the bottleneck

LGA1700

Cards that use the Core i9-12900K fully

RX 7900 XTX1440p 66

Best CPU for the RTX 4080 Super Best GPU for the Core i9-12900K RTX 4080 Super PSU requirements

Same CPU, other cards

All

Same card, other CPUs

All

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