Will the Core i9-13900K 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 i9-13900K 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 i9-13900K and RTX 3070 Ti?

Sustained gaming load is about 626 W using the RTX 3070 Ti's measured draw. A 850 W unit is the safe choice.

Is this pair better at 1080p or 4K?

1080p: GPU-limited 21% (GPU-bound (normal)). 1440p: GPU-limited 28% (GPU-bound (normal)). 4K: GPU-limited 44% (CPU overkill).

Core i9-13900K + RTX 3070 Ti: bottleneck check

28%

GPU-limited at 1440p. GPU-bound (normal).

CPU GPU

The RTX 3070 Ti is the part working hardest at 1440p, which is what you want. The Core i9-13900K keeps about 28% in reserve.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	GPU	21%	GPU-bound (normal)
1440p	GPU	28%	GPU-bound (normal)
4K	GPU	44%	CPU overkill

The RTX 3070 Ti is the limit at every resolution and by a wide margin at 4K (44%). The Core i9-13900K is overkill for this card: a faster GPU would give you far more frames than any CPU change.

Specifications

Intel Core i9-13900K
Cores / threads	24 / 32
Max boost	5.8 GHz
Socket	LGA1700
Maximum turbo power (MTP)	253 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	85 / 100
Multi-core index	93 / 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 i9-13900K at its maximum turbo power of 253 W and about 75 W for the rest of the system, the sustained load is about 626 W. A 850 W unit is the safe choice. 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 i9-13900K fully

Best CPU for the RTX 3070 Ti Best GPU for the Core i9-13900K 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.