Intel Core i5-6600K vs Intel Core i5-8400
29Single-core31.1
24Multi-core28.6
23.8Gaming27.2
3 spec wins — Intel Core i5-6600K14 spec wins — Intel Core i5-8400
InnoReviews verdict
Intel Core i5-8400 wins this desktop processor face-off, 29 to 25.4, pulling ahead mainly in Multi-core (+5) and gaming (+3). Intel Core i5-6600K still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the Intel Core i5-6600K
- 25% higher Base clock: 3.5 GHz vs 2.8 GHz
- 10% higher iGPU clock: 1,150 MHz vs 1,050 MHz
- Has Unlocked multiplier — the other doesn't
Reasons to pick the Intel Core i5-8400
- Stronger Multi-core score: 29 vs 24
- Stronger gaming score: 27 vs 24
- 58% higher Cinebench R23 (multi): 6,400 vs 4,050
- 50% higher cores: 6 vs 4
- 50% higher Performance cores: 6 vs 4
- Lower launch price: $182 vs $242
General
| Spec | Intel Core i5-6600K | Intel Core i5-8400 |
|---|---|---|
| Announced | 2015 | 2017 |
| Socket | LGA1151 | LGA1151-v2 |
| Process | 14 nm | 14 nm |
| Base TDP | 91 W | 65 W+29% |
| Unlocked multiplier | Yes | No |
| Cooler included | No | Yes |
Cores & Clocks
| Spec | Intel Core i5-6600K | Intel Core i5-8400 |
|---|---|---|
| Cores | 4 | 6+50% |
| Performance cores | 4 | 6+50% |
| Efficiency cores | 0 | 0 |
| Threads | 4 | 6+50% |
| Base clock | 3.5 GHz+25% | 2.8 GHz |
| Boost clock | 3.9 GHz | 4 GHz+3% |
| L2 cache | 1 MB | 2 MB+50% |
| L3 cache | 6 MB | 9 MB+50% |
Integrated GPU
| Spec | Intel Core i5-6600K | Intel Core i5-8400 |
|---|---|---|
| iGPU | Intel HD Graphics 530 | Intel UHD Graphics 630 |
| iGPU clock | 1,150 MHz+10% | 1,050 MHz |
Memory
| Spec | Intel Core i5-6600K | Intel Core i5-8400 |
|---|---|---|
| Memory support | DDR4-2133 / DDR3L-1600 | DDR4-2666 |
| Max memory | 64 GB | 64 GB |
| Memory channels | 2 | 2 |
Platform
| Spec | Intel Core i5-6600K | Intel Core i5-8400 |
|---|---|---|
| PCIe version | 3 | 3 |
| CPU PCIe lanes | 16 | 16 |
Benchmarks
| Spec | Intel Core i5-6600K | Intel Core i5-8400 |
|---|---|---|
| Geekbench 6 (single) | 1,300Top 77% | 1,370+5%Top 75% |
| Geekbench 6 (multi) | 3,350Top 90% | 4,900+46%Top 78% |
| Cinebench R23 (single) | 1,110Top 78% | 1,150+4%Top 75% |
| Cinebench R23 (multi) | 4,050Top 90% | 6,400+58%Top 77% |
| PassMark | 6,400Top 89% | 9,200+44%Top 80% |
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