Will the Core i5-12400F bottleneck the RX 7800 XT?

Only slightly: at 1440p the model puts the Core i5-12400F about 2% short of keeping the RX 7800 XT 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 i5-12400F and RX 7800 XT?

Sustained gaming load is about 442 W using the RX 7800 XT's measured draw. A 750 W unit is the safe choice; a good-quality 650 W unit also covers it.

Is this pair better at 1080p or 4K?

1080p: CPU-limited 10% (balanced). 1440p: CPU-limited 2% (balanced). 4K: GPU-limited 20% (balanced).

Core i5-12400F + RX 7800 XT: 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	10%	balanced
1440p	CPU	2%	balanced
4K	GPU	20%	balanced

This is the classic pattern: at 1080p the Core i5-12400F is the limit (10%), while at 4K the RX 7800 XT takes over (20% 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

AMD Radeon RX 7800 XT
VRAM	16 GB
Board power	263 W
Released	2023
1080p index	51.7 / 100
1440p index	46 / 100
4K index	40.9 / 100

Power supply

The RX 7800 XT measured 250 W average while gaming (318 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 442 W. A 750 W unit is the safe choice; a good-quality 650 W unit also covers the measured draw. Details on the RX 7800 XT PSU page or try other pairs in the PSU calculator.

Upgrade paths

CPUs that remove the bottleneck

LGA1700

Cards that use the Core i5-12400F fully

Best CPU for the RX 7800 XT Best GPU for the Core i5-12400F RX 7800 XT 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.