Intel Core i7 8700K vs i5 8400: performance comparison
VS
Intel Core i7 8700K
Intel Core i5 8400
We compared two 6-core desktop CPUs: the 3.7 GHz Intel Core i7 8700K against the 2.8 GHz i5 8400. On this page, you’ll find out which processor has better performance in benchmarks, games and other useful information.
- Review
- Differences
- Performance
- Specs
- Comments
Review
General overview and comparison of the processors
Single-Core Performance
Performance in single-threaded apps and benchmarks
Core i7 8700K
56
Core i5 8400
48
Performance
Measure performance when all cores are involved
Core i7 8700K
34
Core i5 8400
23
Power Efficiency
The efficiency score of electricity consumption
Core i7 8700K
44
Core i5 8400
45
NanoReview Final Score
Generic CPU rating
Core i7 8700K
45
Core i5 8400
38
Key Differences
What are the key differences between 8400 and 8700K
Advantages of Intel Core i7 8700K
- Unlocked multiplier
- Has 3 MB larger L3 cache size
- 18% higher Turbo Boost frequency (4.
7 GHz vs 4 GHz)
- 20% faster in a single-core Geekbench v5 test — 1242 vs 1034 points
Benchmarks
Comparing the performance of CPUs in benchmarks
Cinebench R23 (Single-Core)
Core i7 8700K
+18%
1209
Core i5 8400
1025
Cinebench R23 (Multi-Core)
Core i7 8700K
+52%
8838
Core i5 8400
5829
Passmark CPU (Single-Core)
Core i7 8700K
+15%
2742
Core i5 8400
2393
Passmark CPU (Multi-Core)
Core i7 8700K
+48%
13641
Core i5 8400
9235
Geekbench 5 (Single-Core)
Core i7 8700K
+20%
1236
Core i5 8400
1030
Geekbench 5 (Multi-Core)
Core i7 8700K
+43%
6592
Core i5 8400
4608
Submit your Cinebench R23 result
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This does not affect our assessment methodology.
Specifications
Full technical specification of Intel Core i7 8700K and i5 8400
General
| Vendor | Intel | Intel |
| Released | October 5, 2017 | October 5, 2017 |
| Type | Desktop | Desktop |
| instruction set | x86-64 | x86-64 |
| Codename | Coffee Lake | Coffee Lake |
| Model number | i7-8700K | i5-8400 |
| Integrated GPU | UHD Graphics 630 | UHD Graphics 630 |
| P-Cores | 6 | 6 |
| P-Threads | 12 | 6 |
| Base Frequency (P) | 3. 7 GHz |
2.8 GHz |
| Turbo Boost Frequency (P) | 4.7 GHz | 4 GHz |
| Total Cores | 6 | 6 |
| Total Threads | 12 | 6 |
| Bus Frequency | 100 MHz | 100 MHz |
| Multiplier | 37x | 28x |
| Bus Bandwidth | 8 GT/s | 8 GT/s |
| L1 Cache | 64K (per core) | 64K (per core) |
| L2 Cache | 256K (per core) | 256K (per core) |
| L3 Cache | 12MB (shared) | 9MB (shared) |
| Unlocked Multiplier | Yes | No |
Package
| Fabrication process | 14 nm | 14 nm |
| Socket | LGA-1151 | LGA-1151 |
| TDP | 95 W | 65 W |
| Peak temperature | 100°C | 100°C |
| Integrated Graphics | Intel UHD Graphics 630 | Intel UHD Graphics 630 |
| GPU Base Clock | 350 MHz | 350 MHz |
| GPU Boost Clock | 1200 MHz | 1050 MHz |
| Shading Units | 192 | 192 |
| TMUs | 24 | 24 |
| ROPs | 3 | 3 |
| Execution Units | 24 | 24 |
| TGP | 15 W | 15 W |
Max. Resolution |
4096×2304 — 60 Hz | 4096×2304 — 60 Hz |
iGPU FLOPS
Core i7 8700K
0.38 TFLOPS
Core i5 8400
0.38 TFLOPS
Memory Support
| Memory types | DDR4-2666 | DDR4-2666 |
| Memory Size | 128 GB | 128 GB |
| Max. Memory Channels | 2 | 2 |
| Max. Memory Bandwidth | 41.6 GB/s | 41.6 GB/s |
| ECC Support | No | No |
| Official site | Intel Core i7 8700K official page | Intel Core i5 8400 official page |
| PCI Express Version | 3.0 | 3.0 |
| PCI Express Lanes | 16 | 16 |
| Extended instructions | SSE4. 1, SSE4.2, AVX-2 |
SSE4.1, SSE4.2, AVX-2 |
Cast your vote
Choose between two processors
Core i7 8700K
6 (85.7%)
Core i5 8400
1 (14.3%)
Total votes: 7
ompetitors
1.
AMD Ryzen 5 5600X and Intel Core i7 8700K
2.
Intel Core i7 12700K and i7 8700K
3.
Intel Core i5 12600K and i7 8700K
4.
Intel Core i5 12400F and i7 8700K
5.
Intel Core i7 13700K and i7 8700K
6.
AMD Ryzen 7 5800X3D and Intel Core i7 8700K
7.
Intel Core i5 12600K and i5 8400
8.
Intel Core i5 12400 and i5 8400
9.
Intel Core i5 12400F and i5 8400
Compare other CPUs (480+)
So which CPU will you choose: Intel Core i5 8400 or i7 8700K?
Name
Message
Promotion
Core i7-8700K vs Core i5-8400
Key Differences
In short — Core i7-8700K outperforms the cheaper Core i5-8400 on the selected game parameters.
However, the worse performing Core i5-8400 is a better bang for your buck. The better performing Core i7-8700K and the cheaper Core i5-8400 have been released at the same time.
Advantages of Intel Core i7-8700K
- Performs up to 10% better in Apex Legends than Core i5-8400 — 296 vs 269 FPS
- Can execute more multi-threaded tasks simultaneously than Intel Core i5-8400 — 12 vs 6 threads
- Works without a dedicated GPU, while Intel Core i5-8400 doesn’t have integrated graphics
Advantages of Intel Core i5-8400
- Up to 62% cheaper than Core i7-8700K — $133.0 vs $349.88
- Up to 58% better value when playing Apex Legends than Core i7-8700K — $0.49 vs $1.18 per FPS
- Consumes up to 32% less energy than Intel Core i7-8700K — 65 vs 95 Watts
Apex Legends
Resolution
1920×1080
Game Graphics
High
Core i7-8700K
Desktop • Oct 5th, 2017
FPS
296
100%
Value, $/FPS
$1.
18/FPS
-41%
Price, $
$349.88
38%
FPS Winner
Intel Core i7-8700K Desktop Processor 6 Cores up to 4.7GHz Turbo Unlocked LGA1151 300 Series 95W
Buy for $349.88 on Amazon
In Stock
Updated 89 minutes ago
Core i5-8400
Desktop • Oct 5th, 2017
FPS
269
90%
Value, $/FPS
$0.49/FPS
100%
Price, $
$133
100%
Value Winner
Intel Core i5-8400 Desktop Processor 6 Cores up to 4.0 GHz LGA 1151 300 Series 65W
Buy for $133 on Amazon
In Stock
Updated 89 minutes ago
TOP 5 Games
Resolution
1920×1080
Game Graphics
High
Core i7-8700K
Desktop • Oct 5th, 2017
Core i5-8400
Desktop • Oct 5th, 2017
1079
FPS
994
FPS
League of Legends
270
FPS
248
FPS
Grand Theft Auto V
471
FPS
432
FPS
VALORANT
663
FPS
608
FPS
Counter-Strike: Global Offensive
296
FPS
269
FPS
Apex Legends
Geekbench 5 Benchmarks
Core i7-8700K
Desktop • Oct 5th, 2017
Single-Core
1240
100%
Multi-Core
6477
100%
Core i5-8400
Desktop • Oct 5th, 2017
Single-Core
1031
80%
Multi-Core
4492
56%
|
Intel Core i7-8700K |
vs |
Intel Core i5-8400 |
|---|---|---|
| Oct 5th, 2017 | Release Date | Oct 5th, 2017 |
| Core i7 | Collection | Core i5 |
| Coffee Lake | Codename | Coffee Lake |
| Intel Socket 1151 | Socket | Intel Socket 1151 |
|
Desktop |
Segment |
Desktop |
| 6 | Cores | 6 |
|
12 |
Threads | 6 |
|
3. |
