Will the Core i9-13900K bottleneck the RX 6800?

No. At 1440p the RX 6800 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 RX 6800?

Sustained gaming load is about 563 W using the RX 6800's measured draw. A 750 W unit is the safe choice.

Is this pair better at 1080p or 4K?

1080p: GPU-limited 20% (balanced). 1440p: GPU-limited 27% (GPU-bound (normal)). 4K: GPU-limited 43% (CPU overkill).

PCPairs

Core i9-13900K + RX 6800: bottleneck check

27%

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

CPU GPU

The RX 6800 is the part working hardest at 1440p, which is what you want. The Core i9-13900K keeps about 27% in reserve.

By resolution

Resolution	Limiting part	Severity	Verdict
1080p	GPU	20%	balanced
1440p	GPU	27%	GPU-bound (normal)
4K	GPU	43%	CPU overkill

The RX 6800 is the limit at every resolution and by a wide margin at 4K (43%). 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

AMD Radeon RX 6800
VRAM	16 GB
Board power	250 W
Released	2020
1080p index	43.0 / 100
1440p index	37 / 100
4K index	31.9 / 100

Power supply

The RX 6800 measured 235 W average while gaming (344 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 563 W. A 750 W unit is the safe choice. Details on the RX 6800 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 RX 6800 Best GPU for the Core i9-13900K RX 6800 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.