CPU Comparison
Core i5-6400 vs Intel Core i5-7400
A side-by-side comparison of specs, performance and value. The Intel Core i5-6400 is a 6th generation desktop processor launched in July 2015 as part of the Skylake architecture. Designed for the LGA 1151 socket, it brought the 14nm manufacturing process to the mainstream market. This quad-core processor operates at a base frequency of 2.7 GHz and boosts up to 3.3 GHz. Unlike its predecessor, the 6400 natively supports DDR4 memory alongside DDR3L, offering a transitional platform for motherboard manufacturers. It features 6MB of L3 cache and a modest 65W TDP, making it highly energy efficient for its time. The inclusion of Intel HD Graphics 530 provided competent integrated graphics for non-gaming workloads. While it lacked an unlocked multiplier, it became a favorite for budget builders and system integrators. Its reliable quad-core performance made it a staple in office PCs and budget gaming rigs when paired with a dedicated GPU, serving as a workhorse for years before multi-threading demands outpaced its capabilities.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Sufficient for basic office applications and web browsing, but struggles with heavy multitasking.
Solid performance for standard office tasks, but limited by 4 threads in heavy multitasking.
Gaming
Severely bottlenecks modern GPUs. Only playable in older or very light eSports titles.
Can run older games well but will bottleneck modern GPUs significantly.
Virtualization
Limited to very light virtualization due to 4 threads.
Basic VM support is possible, but performance is restricted by core count.
Efficiency
Efficient for its time, but superseded by modern 10nm/Intel 7 processes.
65W TDP is well-managed and easy to cool.
Specialized Performance
AI / ML
- No AI acceleration
- Insufficient threads for modern AI workloads
- No AI acceleration hardware
- Will struggle with any local AI inference
Content Creation
Gaming
- Low base clock limits frame rates
- 4 cores cause stuttering in modern games
- Acceptable only for retro gaming
- Heavily bottlenecked by 4 threads in modern titles
- Acceptable for retro or e-sports titles with a low-end GPU
- HD 630 not suitable for modern gaming without a dedicated GPU
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Low 65W TDP for easy cooling
- Supports both DDR4 and DDR3L memory
- Solid single-core performance for its generation
- Includes HD Graphics 530 for display tasks
Cons
- Only 4 cores and 4 threads
- Low base clock of 2.7 GHz
- Locked multiplier prevents overclocking
- Not supported by Windows 11
Pros
- Good single-core performance for basic tasks
- Low 65W TDP is easy to cool
- Hardware video decoding for modern codecs
- Widely compatible with LGA 1151 motherboards
- Affordable on the used market
Cons
- Only 4 threads limits modern multitasking
- Locked multiplier prevents overclocking
- No PCIe Gen 4 support
- Bottlenecks modern mid-range GPUs
- Not supported on Windows 11 officially
Competitors & Alternatives
Core i5-6400
- AMD FX-8350Rival
Desktop
- Compare head-to-headIntel Core i5-6500Rival
Desktop
- AMD FX-6300Rival
Desktop
- Intel Core i3-6100Rival
Desktop
- AMD Ryzen 5 1400Rival
Desktop
Vastly better performance and platform for a similar budget.
Compare head-to-head- AMD Ryzen 5 3600Alt
More cores and threads for better multi-threaded workloads.
Slight performance bump on the same socket if upgrading cheaply.
Compare head-to-headHyper-threading on the same socket for better multi-core performance.
Compare head-to-head- AMD Ryzen 5 2600Alt
Modern alternative with more threads and better upgrade path.
Intel Core i5-7400
- AMD Ryzen 3 1200Rival
Desktop
- AMD Ryzen 5 1400Rival
Desktop
- Intel Core i3-7100Rival
Desktop
- Intel Core i5-6400Rival
Desktop
- AMD FX-8350Rival
Desktop
Successor with 6 cores, offering vastly superior modern performance.
Compare head-to-head- AMD Ryzen 5 1600Alt
Contemporary AMD alternative with 6 cores and 12 threads.
A slight step up in clock speeds if sticking to 7th Gen.
Compare head-to-head- AMD Ryzen 5 3600Alt
A much better modern alternative for a budget build.
A modern budget CPU that destroys this chip in every metric.
Compare head-to-head
Our Verdict on Each
The Core i5-6400 was a fantastic budget CPU in 2015, but its 4-core/4-thread design and low clock speeds make it heavily outdated for modern gaming and productivity.
Best for: Building a retro gaming PC or basic office machine from used parts
Read the full reviewA standard quad-core CPU of its era that handles basic tasks well, but lacks Hyper-Threading and is heavily bottlenecked in modern multi-threaded workloads.
Best for: Keeping an existing LGA 1151 system alive for basic office work.
Read the full reviewFrequently Asked Questions
Which is faster for gaming, Core i5-6400 or Intel Core i5-7400?
For gaming, the Intel Core i5-7400 leads with a gaming performance score of 45/100 among Core i5-6400 and Intel Core i5-7400.
Do Core i5-6400 and Intel Core i5-7400 use the same socket?
No. They use different sockets (Core i5-6400: LGA 1151, Intel Core i5-7400: Intel Socket 1151), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i5-7400 posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-7400 (5,200). Benchmark figures are approximate and workload-dependent.