AMD Ryzen 9 9900X3D vs Intel Core i5-8400
—Single-core31.1
86.2Multi-core28.6
93.8Gamingspec-based27.2
14 spec wins — AMD Ryzen 9 9900X3D2 spec wins — Intel Core i5-8400
InnoReviews verdict
No overall winner yet: AMD Ryzen 9 9900X3D lacks the published benchmark results an Inno Score requires, so there is no Inno Score to compare — we don't rank chips on their spec sheet alone. The spec table below still shows every difference we track.
Which would you pick?
Key differences
Reasons to pick the AMD Ryzen 9 9900X3D
- Stronger multi-core score: 86 vs 29
- 1322% higher L3 cache: 128 MB vs 9 MB
- 700% higher L2 cache: 12 MB vs 2 MB
- 509% higher PassMark: 56,050 vs 9,200
- 300% higher threads: 24 vs 6
Reasons to pick the Intel Core i5-8400
- 46% lower Base TDP: 65 W vs 120 W
- Has Cooler included — the other doesn't
- Lower launch price: $182 vs $599
General
| Spec | AMD Ryzen 9 9900X3D | Intel Core i5-8400 |
|---|---|---|
| Announced | 2025 | 2017 |
| Socket | AM5 | LGA1151-v2 |
| Process | 4 nm+71% | 14 nm |
| Base TDP | 120 W | 65 W+46% |
| Unlocked multiplier | Yes | No |
| Cooler included | No | Yes |
Cores & Clocks
| Spec | AMD Ryzen 9 9900X3D | Intel Core i5-8400 |
|---|---|---|
| Cores | 12+100% | 6 |
| Performance cores | 12+100% | 6 |
| Efficiency cores | 0 | 0 |
| Threads | 24+300% | 6 |
| Base clock | 4.4 GHz+57% | 2.8 GHz |
| Boost clock | 5.5 GHz+38% | 4 GHz |
| L2 cache | 12 MB+700% | 2 MB |
| L3 cache | 128 MB+1322% | 9 MB |
Integrated GPU
| Spec | AMD Ryzen 9 9900X3D | Intel Core i5-8400 |
|---|---|---|
| iGPU | AMD Radeon Graphics (2 CU RDNA 2) | Intel UHD Graphics 630 |
| iGPU clock | 2,200 MHz | 1,050 MHz |
Memory
| Spec | AMD Ryzen 9 9900X3D | Intel Core i5-8400 |
|---|---|---|
| Memory support | DDR5-5600 | DDR4-2666 |
| Max memory | 256 GB+300% | 64 GB |
| Memory channels | 2 | 2 |
Platform
| Spec | AMD Ryzen 9 9900X3D | Intel Core i5-8400 |
|---|---|---|
| PCIe version | 5+67% | 3 |
| CPU PCIe lanes | 28+75% | 16 |
Benchmarks
| Spec | AMD Ryzen 9 9900X3D | Intel Core i5-8400 |
|---|---|---|
| Geekbench 6 (single) | — | 1,370Bottom 22% |
| Geekbench 6 (multi) | — | 4,900Bottom 20% |
| Cinebench R23 (single) | — | 1,150Bottom 23% |
| Cinebench R23 (multi) | — | 6,400Bottom 19% |
| PassMark | 56,050+509%Top 12% | 9,200Bottom 14% |
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