8th Gen Intel Core i5 8400
- iGPU:
- Intel UHD Graphics 630
- Boost/Base Clock:
- 4.0 GHz / 2.8 GHz
- Core/Thread Count:
- 6 Core / 6 Thread
- Cache:
- 9MB L3 + 1.5MB L2 + 384KB L1
- TDP:
- 65 Watts
- CPU Process Node:
- 14 Nanometers
- CPU Socket:
- LGA 1151
- CPU Series:
- Coffee Lake
- Memory Support:
- DDR4-2666
- Form Factor:
- Desktop
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Manufacturer: Intel Last updated: September 9, 2026
8th Gen Intel Core i5 8400 Review
The 8th Gen Intel Core i5 8400 is a 6-core desktop processor built on Coffee Lake, running a 2.8 GHz base clock that boosts to 4.0 GHz within an efficient 65 Watt TDP on the LGA 1151 socket.
This chip's jump to 6 physical cores from the previous generation's 4-core i5 lineup made it a genuine mainstream gaming value standout at launch, delivering strong multi-core capability without hyperthreading at an accessible price.
Intel UHD Graphics 630
A basic integrated GPU intended for display output; mainstream desktop builds around this chip typically pair it with a discrete GPU for gaming.
How Is the Core i5 8400 in Terms of Performance
The jump to 6 physical cores gave this chip a genuine generational leap over the previous 4-core i5 lineup, delivering strong gaming and everyday performance at a mainstream price point that made it a popular budget gaming CPU choice.
Benchmarks
As a 6-core Coffee Lake chip sharing its core architecture with the i5-8500 and i5-8600K, this processor's real-world gaming and productivity performance sits solidly at the mainstream tier for its generation, trading the higher-clocked K-series' overclocking headroom for a lower, more efficient stock TDP.
Specifications
Identity
| Brand | Intel |
|---|---|
| Product Line | Core i5 |
| Product Line | Core i5 |
| Model Number | 8400 |
| Codename | Coffee Lake |
| Release Year | 2017 |
Segment and platform
| Market Segment | Desktop |
|---|---|
| Microarchitecture | Coffee Lake, 8th Gen Intel Core |
| Socket | LGA 1151 |
| Socket Status | End of Life |
| Process Node | 14 nm |
| Process Node | 14 nm |
Core configuration
| Performance Cores | 6 |
|---|---|
| Efficiency Cores | 0 |
| SMT Enabled | No |
Clock speeds
| P-Core Base Clock | 2.8 GHz |
|---|---|
| P-Core Boost Clock | 4.0 GHz |
Cache
| L2 Cache | 1.5 MB |
|---|---|
| L3 Cache | 9 MB |
Power and thermal
| Base Power | 65 W |
|---|---|
| Max Turbo Power | 65 W |
Memory
| Memory Type | DDR4-2666 |
|---|---|
| Memory Type | DDR4 |
| Max Memory Speed | 2666 MT/s |
| Memory Channels | 2 |
| ECC Support | No |
Graphics and AI
| Integrated Graphics | Yes |
|---|---|
| iGPU Model | Intel UHD Graphics 630 |
| Copilot Plus Certified | No |
Expansion
| PCIe Generation | 3.0 |
|---|---|
| PCIe Lanes | 16 |
Commercial
| Launch MSRP | 182 USD |
|---|---|
| Retail Availability | Retail |
| Form Factor | Desktop |
|---|---|
| Core/Thread Count | 6 Core / 6 Thread |
| TDP | 65 W |
| iGPU | Intel UHD Graphics 630 |
| Cache | 9MB L3 + 1.5MB L2 + 384KB L1 |
| Boost/Base Clock | 4.0 GHz / 2.8 GHz |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Budget-conscious gaming desktop builds wanting genuine 6-core performance without overclocking
Not for
- Enthusiasts wanting to overclock — the unlocked i5-8600K offers that flexibility
FAQs
What are the key specifications of the 8th Gen Intel Core i5 8400?
The 8th Gen Intel Core i5 8400 is a processor from Intel. Key specs: iGPU Intel UHD Graphics 630, Boost/Base Clock 4.0 GHz / 2.8 GHz, Core/Thread Count 6 Core / 6 Thread, Cache 9MB L3 + 1.5MB L2 + 384KB L1, TDP 65 Watts.
Will the 8th Gen Intel Core i5 8400 work with my current setup?
The 8th Gen Intel Core i5 8400 lists CPU Socket is LGA 1151. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the 8th Gen Intel Core i5 8400 best suited to?
It suits budget-conscious gaming desktop builds wanting genuine 6-core performance without overclocking.
What are the drawbacks of the 8th Gen Intel Core i5 8400?
It is a poor fit for enthusiasts wanting to overclock — the unlocked i5-8600k offers that flexibility.