Will the Core i5-12400F bottleneck the RTX 3070 Ti?

No. At 1440p the RTX 3070 Ti is the limiting part, which is the normal state for a gaming PC. The Core i5-12400F has headroom to spare. 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 3070 Ti?

Sustained gaming load is about 490 W using the RTX 3070 Ti'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 2% (balanced). 1440p: GPU-limited 7% (balanced). 4K: GPU-limited 27% (GPU-bound (normal)).

Core i5-12400F + RTX 3070 Ti: bottleneck check

Balanced at 1440p.

CPU GPU

Well matched at 1440p. The RTX 3070 Ti is the slightly busier part, by about 7%.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	CPU	2%	balanced
1440p	GPU	7%	balanced
4K	GPU	27%	GPU-bound (normal)

This is the classic pattern: at 1080p the Core i5-12400F is the limit (2%), while at 4K the RTX 3070 Ti takes over (27% 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 3070 Ti
VRAM	8 GB
Board power	290 W
Released	2021
1080p index	42.0 / 100
1440p index	36 / 100
4K index	30.9 / 100

Power supply

The RTX 3070 Ti measured 298 W average while gaming (350 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 490 W. A 750 W unit is the safe choice; a good-quality 650 W unit also covers the measured draw. Details on the RTX 3070 Ti 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 RTX 3070 Ti Best GPU for the Core i5-12400F RTX 3070 Ti 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.