CPU Comparison
Intel Core i5-2500K vs Intel Core i5-2400
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 legacy Office suites well, but slow for 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.
Bottlenecks modern GPUs heavily, but great for pre-2015 games.
Virtualization
Lacks VT-d, which limits advanced virtualization passthrough configurations, though basic VT-x works fine.
Adequate for a basic pfSense router or NAS OS.
Efficiency
When overclocked, power consumption can easily exceed 150 W, making it highly inefficient by modern standards.
Consumes more power per percentage of performance than modern chips.
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 acceleration
- Cannot run modern local LLMs at usable speeds
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
- Paired with a GTX 1060, it can run Skyrim and Fallout 3 excellently
- Will severely bottleneck anything above an RTX 2060
- Single-core speed is too low for modern eSports titles like Valorant
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
- Very cheap on the used market
- Excellent upgrade path to i7-3770
- Good retro-gaming performance
- Easy to cool
Cons
- No Hyper-Threading
- No modern instruction set support
- High power draw relative to performance
- Locked multiplier
- Weak HD 2000 graphics
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 i5-2400
- AMD Phenom II X4 970Rival
Desktop
- AMD FX-4150Rival
Desktop
- AMD A8-3870KRival
Desktop APU
- Compare head-to-headIntel Core i5-760Rival
Desktop
- Intel Xeon E3-1230Rival
Server/Workstation
Better clocks for nearly the same used price.
Compare head-to-head- Intel Core i5-3450Alt
Ivy Bridge upgrade with PCIe 3.0 and lower power.
- AMD FX-6300Alt
More threads for heavily multi-threaded legacy tasks.
- Intel Xeon E3-1245Alt
Better integrated graphics and similar performance.
- Intel Core i7-2600Alt
Adds Hyper-Threading for a significant multi-thread boost.
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 reviewAn iconic processor that dominated the 2011 market, now best suited for retro gaming builds and lightweight server tasks.
Best for: Building a cheap retro-gaming PC or home server using recycled parts
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-2500K or Intel Core i5-2400?
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 i5-2400?
For gaming, the Intel Core i5-2500K leads with a gaming performance score of 22/100 among Intel Core i5-2500K and Intel Core i5-2400.
Do Intel Core i5-2500K and Intel Core i5-2400 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 i5-2400 (2,800). Benchmark figures are approximate and workload-dependent.