CPU Comparison
Intel Core i5-2500K vs Intel Core i5-2400S
A side-by-side comparison of specs, performance and value. The Intel Core i5-2500K is an unlocked 95 W quad-core Sandy Bridge desktop processor that revolutionized enthusiast overclocking with its accessible multiplier adjustments, featuring 3.3 GHz base, 3.7 GHz turbo, and Intel HD 3000 graphics.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Fast for its era, but lacks the threads and IPC for modern productivity suites.
Handles basic office tasks but struggles with heavy spreadsheets or modern web apps.
Gaming
When overclocked to 4.5 GHz+, it can still handle older esports titles, but is heavily bottlenecked in modern CPU-intensive games.
Cannot handle modern AAA games, even at lowest settings.
Virtualization
Lacks VT-d, which limits advanced virtualization passthrough configurations, though basic VT-x works fine.
Can run a basic NAS OS or light VM, but limited by 4 threads.
Efficiency
When overclocked, power consumption can easily exceed 150 W, making it highly inefficient by modern standards.
Good power-to-core ratio for the 32nm era.
Specialized Performance
AI / ML
- No AI acceleration hardware
- Lacks AVX2 and modern vector instructions required for AI frameworks
- Completely unsuitable for AI workloads
- No AI hardware capabilities
- Too slow for practical machine learning inference
Content Creation
Gaming
- At stock speeds, it is outperformed by modern budget CPUs
- When overclocked to 4.5+ GHz, it remains playable in older esports titles like CS:GO
- Severe bottleneck in modern open-world and CPU-heavy games
- PCIe 2.0 may slightly limit top-tier GPU performance
- HD 2000 graphics lack driver support for modern titles
- Even with a discrete GPU, CPU bottlenecks severely
- Playable only in legacy esports like CS 1.6
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Legendary overclocking headroom (4.5-5.0 GHz on air/water)
- Unlocked multiplier made tuning accessible to beginners
- Intel HD 3000 with Quick Sync was excellent for video encoding
- Launched at an incredibly competitive $216
- Historic significance in the enthusiast PC community
Cons
- No Hyper-Threading (4 cores, 4 threads)
- Limited to PCIe 2.0
- Lacks VT-d for advanced virtualization
- High power draw when overclocked
- Completely obsolete for modern gaming and productivity
Pros
- True quad-core CPU
- Low 65W power draw
- Cool and quiet operation
- Full 6 MB L3 cache
Cons
- No Hyper-Threading
- Low clock speeds
- Outdated HD 2000 graphics
- Not Windows 11 compatible
- Locked multiplier
Competitors & Alternatives
Intel Core i5-2500K
- AMD Phenom II X4 980Rival
Desktop Performance
- AMD Bulldozer FX-4150Rival
Desktop Enthusiast
- Intel Core i7-2600KRival
Desktop Premium
- Compare head-to-headIntel Core i5-2400Rival
Desktop Mainstream
- AMD FX-6100Rival
Desktop Multi-thread
Ivy Bridge successor with PCIe 3.0, better integrated graphics, and cooler running temperatures.
Compare head-to-head- AMD Ryzen 5 5600Alt
A modern budget option that offers vastly superior performance for a similar inflation-adjusted price.
Intel Core i5-2400S
- AMD Phenom II X4 960TRival
Desktop
- AMD FX-4100Rival
Desktop
- AMD A8-3800Rival
Desktop APU
- Compare head-to-headIntel Core i5-2390TRival
Desktop
- Intel Core i3-2125Rival
Desktop
Standard power, faster clocks for tower PCs.
Compare head-to-headSame power, better integrated graphics.
Compare head-to-head- AMD FX-4300Alt
Slightly newer platform with more upgrade paths.
- Intel Core i7-2600SAlt
Same 65W TDP but adds Hyper-Threading.
- Intel Xeon E3-1235Alt
Similar specs with better graphics, though 80W TDP.
Our Verdict on Each
A historic processor that offered unmatched overclocking headroom for its price. While obsolete for modern gaming, its legacy as the king of early 2010s budget performance is well-deserved.
Best for: Restoring a vintage 2011 gaming rig or for a collector wanting a piece of PC hardware history.
Read the full reviewA power-efficient quad-core chip that is now strictly relegated to keeping legacy small form factor office PCs operational.
Best for: Direct replacement for a failed CPU in a Dell Optiplex SFF
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-2500K or Intel Core i5-2400S?
Based on our editorial ratings, the Intel Core i5-2500K comes out ahead with a score of 7/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which is faster for gaming, Intel Core i5-2500K or Intel Core i5-2400S?
For gaming, the Intel Core i5-2500K leads with a gaming performance score of 22/100 among Intel Core i5-2500K and Intel Core i5-2400S.
Which uses less power?
The Intel Core i5-2400S has the lowest rated TDP. Power draw across these chips: Intel Core i5-2500K (95 W), Intel Core i5-2400S (65 W).
Do Intel Core i5-2500K and Intel Core i5-2400S use the same socket?
Yes — all of these CPUs use the LGA 1155 socket, so they share compatible motherboards.
Which is faster in multi-core benchmarks?
The Intel Core i5-2500K posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-2500K (4,200), Intel Core i5-2400S (2,400). Benchmark figures are approximate and workload-dependent.