Will the Core i5-10400F bottleneck the GTX 1080 Ti?

No. At 1440p the GTX 1080 Ti is the limiting part, which is the normal state for a gaming PC. The Core i5-10400F has headroom to spare.

What power supply do I need for a Core i5-10400F and GTX 1080 Ti?

Estimated system load is about 415 W. A quality 550 W unit leaves roughly 30% headroom for transient spikes.

Is this pair better at 1080p or 4K?

1080p: CPU-limited 16% (mild CPU bottleneck). 1440p: CPU-limited 7% (balanced). 4K: GPU-limited 17% (balanced).

PCPairs

Core i5-10400F + GTX 1080 Ti: bottleneck check

Balanced at 1440p.

CPU GPU

Well matched at 1440p. The Core i5-10400F is the slightly busier part, by about 7%.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	CPU	16%	mild CPU bottleneck
1440p	CPU	7%	balanced
4K	GPU	17%	balanced

This is the classic pattern: at 1080p the Core i5-10400F is the limit (16%), while at 4K the GTX 1080 Ti takes over (17% 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 i5-10400F
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 GTX 1080 Ti
VRAM	11 GB
Board power	250 W
Released	2017
1080p index	28.7 / 100
1440p index	23 / 100
4K index	18.4 / 100

Power supply

CPU 65 W + GPU 250 W + about 100 W for motherboard, memory, storage and fans gives an estimated peak load of 415 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.

Upgrade paths

CPUs that remove the bottleneck

LGA1200

Cards that use the Core i5-10400F fully

Best CPU for the GTX 1080 Ti Best GPU for the Core i5-10400F GTX 1080 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.