Core i5-13600K + RTX 4090: bottleneck check
CPU-limited at 1440p. Mild CPU bottleneck.
The Core i5-13600K cannot feed the RTX 4090 fast enough at 1440p, so the card sits partly idle in CPU-heavy games.
By resolution
| Resolution | Limiting part | Severity | Verdict |
|---|---|---|---|
| 1080p | CPU | 19% | mild CPU bottleneck |
| 1440p | CPU | 13% | mild CPU bottleneck |
| 4K | GPU | 9% | balanced |
This is the classic pattern: at 1080p the Core i5-13600K is the limit (19%), while at 4K the RTX 4090 takes over (9% 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
| Cores / threads | 14 / 20 |
|---|---|
| Max boost | 5.1 GHz |
| Socket | LGA1700 |
| Maximum turbo power (MTP) | 181 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 | 78 / 100 |
| Multi-core index | 74 / 100 |
| VRAM | 24 GB |
|---|---|
| Board power | 450 W |
| Released | 2022 |
| 1080p index | 84.5 / 100 |
| 1440p index | 82 / 100 |
| 4K index | 79.6 / 100 |
Power supply
The RTX 4090 measured 346 W average while gaming (499 W highest 20 ms spike, TechPowerUp). With the Core i5-13600K at its maximum turbo power of 181 W and about 75 W for the rest of the system, the sustained load is about 602 W. A 1000 W unit is the safe choice. Details on the RTX 4090 PSU page or try other pairs in the PSU calculator.
Best CPU for the RTX 4090 Best GPU for the Core i5-13600K RTX 4090 PSU requirements
Same CPU, other cards
AllSame card, other CPUs
AllIndexes are relative estimates aggregated from published reviews; real results vary by game, settings, memory speed and drivers. Methodology.