i7-8700K vs Ryzen 9 3900X
Full specification comparison between the Intel Core i7-8700K (2017) and the AMD Ryzen 9 3900X (2019).
i7-8700K
Intel Entry-level
- ✓ Higher boost clock (4.7 vs 4.6 GHz)
- ✓ Has integrated graphics
- ✓ Lower power draw (95 W vs 105 W)
- ✓ Cheaper at launch ($359 vs $499)
- ✓ Better performance per dollar
Ryzen 9 3900X
AMD Entry-level
- ✓ ~12% faster on average
- ✓ More cores (12 vs 6)
- ✓ Larger L3 cache (64 MB vs 12 MB)
- ✓ Newer (2019 vs 2017)
- ✓ More power-efficient
Verdict: The Ryzen 9 3900X is around 12% faster than the i7-8700K on average — a modest edge you may notice in demanding titles, but not a generational leap.
Note they use different platforms (AM4 vs LGA1151), so this is a motherboard decision too, not just a CPU swap.
At launch pricing, the i7-8700K offers more performance per dollar, and the Ryzen 9 3900X 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 | i7-8700K | Ryzen 9 3900X |
|---|---|---|
| Family | Coffee Lake | Zen 2 |
| Socket | LGA1151 | AM4 |
| Release year | 2017 | 2019 |
| Est. gaming perf. | ||
| Est. multi-core perf. | ||
| Est. single-core perf. | ||
| Cores | ||
| Threads | ||
| Max boost clock | ||
| L3 cache | ||
| TDP (base) | ||
| Integrated graphics | UHD 630 | None |
| Launch MSRP |
Green bars mark the better value in each row (for power and price, lower wins).
Frequently asked questions
Is the Ryzen 9 3900X better than the i7-8700K?
Yes — based on aggregated benchmark data, the Ryzen 9 3900X is about 12% faster than the i7-8700K on average.
How much faster is the Ryzen 9 3900X than the i7-8700K?
Roughly 12% on average in gaming workloads. The gap varies by title, resolution and settings.
Which processor is better value?
Comparing launch prices, the i7-8700K delivers more performance per dollar. Check current street prices, as market pricing often shifts the value equation.