Will the Core i5-12400F bottleneck the RTX 4080 Super?

Yes, at 1440p the Core i5-12400F is estimated to limit the RTX 4080 Super by about 16%. The effect is larger at 1080p and smaller at 4K. This is a model estimate from performance indexes, not a measured FPS loss.

What power supply do I need for a Core i5-12400F and RTX 4080 Super?

Sustained gaming load is about 494 W using the RTX 4080 Super's measured draw. A 750 W unit is the safe choice.

Is this pair better at 1080p or 4K?

1080p: CPU-limited 22% (mild CPU bottleneck). 1440p: CPU-limited 16% (mild CPU bottleneck). 4K: GPU-limited 6% (balanced).

Core i5-12400F + RTX 4080 Super: bottleneck check

16%

CPU-limited at 1440p. Mild CPU bottleneck.

CPU GPU

The Core i5-12400F cannot feed the RTX 4080 Super fast enough at 1440p, so the card sits partly idle in CPU-heavy games.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	CPU	22%	mild CPU bottleneck
1440p	CPU	16%	mild CPU bottleneck
4K	GPU	6%	balanced

This is the classic pattern: at 1080p the Core i5-12400F is the limit (22%), while at 4K the RTX 4080 Super takes over (6% 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 i5-12400F
Cores / threads	6 / 12
Max boost	4.4 GHz
Socket	LGA1700
Maximum turbo power (MTP)	117 W Intel's published maximum sustained turbo power, above its base power; the PSU estimate uses it, so it errs high · Intel ARK
Released	2022
Gaming index	66 / 100
Multi-core index	48 / 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 i5-12400F at its maximum turbo power of 117 W and about 75 W for the rest of the system, the sustained load is about 494 W. A 750 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

Best CPU for the RTX 4080 Super Best GPU for the Core i5-12400F 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.