i5-11400F vs i5-8400
Full specification comparison between the Intel Core i5-11400F (2021) and the Intel Core i5-8400 (2017).
i5-11400F
Intel Entry-level
- ✓ ~28% faster on average
- ✓ Larger L3 cache (12 MB vs 9 MB)
- ✓ Higher boost clock (4.4 vs 4.0 GHz)
- ✓ Cheaper at launch ($157 vs $182)
- ✓ Newer (2021 vs 2017)
Verdict: The i5-11400F is roughly 28% faster than the i5-8400 on average — a clear, noticeable performance advantage.
Note they use different platforms (LGA1200 vs LGA1151), so this is a motherboard decision too, not just a CPU swap.
At launch pricing, the i5-11400F offers more performance per dollar, and the i5-11400F is the more power-efficient chip.
Estimated performance
Estimated average 1080p gaming performance compiled from publicly available benchmark data. Individual games vary.
Specs side by side
| Specification | i5-11400F | i5-8400 |
|---|---|---|
| Family | Rocket Lake | Coffee Lake |
| Socket | LGA1200 | LGA1151 |
| Release year | 2021 | 2017 |
| Est. gaming perf. | ||
| Est. multi-core perf. | ||
| Est. single-core perf. | ||
| Cores | ||
| Threads | ||
| Max boost clock | ||
| L3 cache | ||
| TDP (base) | ||
| Integrated graphics | None | UHD 630 |
| Launch MSRP |
Green bars mark the better value in each row (for power and price, lower wins).
Frequently asked questions
Is the i5-11400F better than the i5-8400?
Yes — based on aggregated benchmark data, the i5-11400F is about 28% faster than the i5-8400 on average.
How much faster is the i5-11400F than the i5-8400?
Roughly 28% on average in gaming workloads. The gap varies by title, resolution and settings.
Which processor is better value?
Comparing launch prices, the i5-11400F delivers more performance per dollar. Check current street prices, as market pricing often shifts the value equation.