Will the Core i7-14700K bottleneck the RX 7800 XT?

No. At 1440p the RX 7800 XT is the limiting part, which is the normal state for a gaming PC. The Core i7-14700K has headroom to spare.

What power supply do I need for a Core i7-14700K and RX 7800 XT?

Estimated system load is about 616 W. A quality 850 W unit leaves roughly 30% headroom for transient spikes.

Is this pair better at 1080p or 4K?

1080p: GPU-limited 15% (balanced). 1440p: GPU-limited 21% (GPU-bound (normal)). 4K: GPU-limited 38% (GPU-bound (normal)).

PCPairs

Core i7-14700K + RX 7800 XT: bottleneck check

21%

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

CPU GPU

The RX 7800 XT is the part working hardest at 1440p, which is what you want. The Core i7-14700K keeps about 21% in reserve.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	GPU	15%	balanced
1440p	GPU	21%	GPU-bound (normal)
4K	GPU	38%	GPU-bound (normal)

The RX 7800 XT is the limiting part at every resolution, which is the healthy direction, and the gap is small enough that neither part is wasted. Upgrade the GPU first when you want more frames.

Specifications

Intel Core i7-14700K
Cores / threads	20 / 28
Max boost	5.6 GHz
Socket	LGA1700
Max turbo power	253 W
Released	2023
Gaming index	86 / 100
Multi-core index	90 / 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

CPU 253 W + GPU 263 W + about 100 W for motherboard, memory, storage and fans gives an estimated peak load of 616 W. We recommend a 850 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

LGA1700

Cards that use the Core i7-14700K fully

Best CPU for the RX 7800 XT Best GPU for the Core i7-14700K 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.