Will the Core i5-10400F bottleneck the RTX 4070?

Yes, at 1440p the Core i5-10400F is estimated to limit the RTX 4070 by about 23%. The effect is larger at 1080p and smaller at 4K.

What power supply do I need for a Core i5-10400F and RTX 4070?

Estimated system load is about 365 W. A quality 550 W unit leaves roughly 30% headroom for transient spikes.

Is this pair better at 1080p or 4K?

1080p: CPU-limited 30% (moderate CPU bottleneck). 1440p: CPU-limited 23% (mild CPU bottleneck). 4K: CPU-limited 2% (balanced).

PCPairs

Core i5-10400F + RTX 4070: bottleneck check

23%

CPU-limited at 1440p. Mild CPU bottleneck.

CPU GPU

The Core i5-10400F cannot feed the RTX 4070 fast enough at 1440p, so the card sits partly idle in CPU-heavy games.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	CPU	30%	moderate CPU bottleneck
1440p	CPU	23%	mild CPU bottleneck
4K	CPU	2%	balanced

The Core i5-10400F is the limiting part at every resolution, even at 4K (2%). The RTX 4070 is a much stronger card than this processor can drive — plan a CPU upgrade before spending more on graphics.

Specifications

Intel Core i5-10400F
Cores / threads	6 / 12
Max boost	4.3 GHz
Socket	LGA1200
Max turbo power	65 W
Released	2020
Gaming index	50 / 100
Multi-core index	38 / 100

NVIDIA GeForce RTX 4070
VRAM	12 GB
Board power	200 W
Released	2023
1080p index	47.8 / 100
1440p index	42 / 100
4K index	36.9 / 100

Power supply

CPU 65 W + GPU 200 W + about 100 W for motherboard, memory, storage and fans gives an estimated peak load of 365 W. We recommend a 550 W unit (80 Plus Gold or better) so transient spikes from the graphics card stay inside the PSU's comfort zone. Try other pairs in the PSU calculator.

Best CPU for the RTX 4070 Best GPU for the Core i5-10400F RTX 4070 PSU requirements

Compare nearby pairs

Same CPU, other GPUs

Same GPU, other CPUs

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