Core Ultra 5 245K + RTX 4090: bottleneck check
CPU-limited at 1440p. Mild CPU bottleneck.
The Core Ultra 5 245K 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 | 21% | mild CPU bottleneck |
| 1440p | CPU | 15% | mild CPU bottleneck |
| 4K | GPU | 7% | balanced |
This is the classic pattern: at 1080p the Core Ultra 5 245K is the limit (21%), while at 4K the RTX 4090 takes over (7% 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 / 14 |
|---|---|
| Max boost | 5.2 GHz |
| Socket | LGA1851 |
| Max turbo power | 159 W |
| Released | 2024 |
| Gaming index | 76 / 100 |
| Multi-core index | 78 / 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
CPU 159 W + GPU 450 W + about 100 W for motherboard, memory, storage and fans gives an estimated peak load of 709 W. We recommend a 1000 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.
Best CPU for the RTX 4090 Best GPU for the Core Ultra 5 245K RTX 4090 PSU requirements
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Indexes are relative estimates aggregated from published reviews; real results vary by game, settings, memory speed and drivers. Methodology.