Will the Core Ultra 7 265K bottleneck the Arc B580?

No. At 1440p the Arc B580 is the limiting part, which is the normal state for a gaming PC. The Core Ultra 7 265K 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 Ultra 7 265K and Arc B580?

Sustained gaming load is about 510 W using the Arc B580's measured draw. A 650 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).

PCPairs

Core Ultra 7 265K + Arc B580: bottleneck check

28%

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

CPU GPU

The Arc B580 is the part working hardest at 1440p, which is what you want. The Core Ultra 7 265K 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 Arc B580 is the limit at every resolution and by a wide margin at 4K (44%). The Core Ultra 7 265K is overkill for this card: a faster GPU would give you far more frames than any CPU change.

Specifications

Intel Core Ultra 7 265K
Cores / threads	20 / 20
Max boost	5.5 GHz
Socket	LGA1851
Maximum turbo power (MTP)	250 W Intel's published maximum sustained turbo power, above its base power; the PSU estimate uses it, so it errs high · Intel ARK
Released	2024
Gaming index	80 / 100
Multi-core index	90 / 100

Intel Arc B580
VRAM	12 GB
Board power	190 W
Released	2024
1080p index	34.9 / 100
1440p index	29 / 100
4K index	24.1 / 100

Power supply

The Arc B580 measured 185 W average while gaming (237 W highest 20 ms spike, TechPowerUp). With the Core Ultra 7 265K at its maximum turbo power of 250 W and about 75 W for the rest of the system, the sustained load is about 510 W. A 650 W unit is the safe choice. Details on the Arc B580 PSU page or try other pairs in the PSU calculator.

Upgrade paths

CPUs that remove the bottleneck

LGA1851

Cards that use the Core Ultra 7 265K fully

Best CPU for the Arc B580 Best GPU for the Core Ultra 7 265K Arc B580 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.