Core i5-10400F + RTX 4080: bottleneck check
CPU-limited at 1440p. Moderate CPU bottleneck.
The Core i5-10400F cannot feed the RTX 4080 fast enough at 1440p, so the card sits partly idle in CPU-heavy games.
By resolution
| Resolution | Limiting part | Severity | Verdict |
|---|---|---|---|
| 1080p | CPU | 40% | moderate CPU bottleneck |
| 1440p | CPU | 35% | moderate CPU bottleneck |
| 4K | CPU | 18% | mild CPU bottleneck |
The Core i5-10400F is the limiting part at every resolution, even at 4K (18%). The RTX 4080 is a much stronger card than this processor can drive — plan a CPU upgrade before spending more on graphics.
Specifications
| Cores / threads | 6 / 12 |
|---|---|
| Max boost | 4.3 GHz |
| Socket | LGA1200 |
| TDP | 65 W manufacturer-published TDP — sustained turbo can be higher · Intel ARK |
| Released | 2020 |
| Gaming index | 50 / 100 |
| Multi-core index | 38 / 100 |
| VRAM | 16 GB |
|---|---|
| Board power | 320 W |
| Released | 2022 |
| 1080p index | 66.6 / 100 |
| 1440p index | 62 / 100 |
| 4K index | 57.7 / 100 |
Power supply
The RTX 4080 measured 304 W average while gaming (371 W highest 20 ms spike, TechPowerUp). With the Core i5-10400F at its TDP of 65 W and about 75 W for the rest of the system, the sustained load is about 444 W. A 750 W unit is the safe choice; a good-quality 650 W unit also covers the measured draw. Details on the RTX 4080 PSU page or try other pairs in the PSU calculator.
Best CPU for the RTX 4080 Best GPU for the Core i5-10400F RTX 4080 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.