CPU Comparison
Intel Core i5-2500K vs Intel Core i5-2550K
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.
Marginally faster than the 2500K in multi-threaded tasks due to 100 MHz higher clocks, but still inadequate for modern software.
Gaming
When overclocked to 4.5 GHz+, it can still handle older esports titles, but is heavily bottlenecked in modern CPU-intensive games.
The slight clock bump over the 2500K is imperceptible in games. Still completely obsolete for modern titles.
Virtualization
Lacks VT-d, which limits advanced virtualization passthrough configurations, though basic VT-x works fine.
Lacks VT-d, and the lack of an iGPU means no iGPU passthrough, reducing its utility in virtualization setups.
Efficiency
When overclocked, power consumption can easily exceed 150 W, making it highly inefficient by modern standards.
Despite the disabled iGPU, power consumption when overclocked is still very high by modern standards.
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
- Lacks AVX2 and modern instruction extensions
- Unable to handle any practical AI workload
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
- Virtually identical gaming performance to an overclocked i5-2500K
- Cannot function without a discrete graphics card
- Modern games are heavily CPU-limited on this architecture
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
- Slightly higher clocks out of the box than the 2500K
- Unlocked multiplier for easy overclocking
- Disabled iGPU meant 100% of the die was dedicated to CPU tasks
- Has become a unique collector's piece
- No iGPU driver conflicts for pure discrete GPU systems
Cons
- No integrated graphics whatsoever
- Lost Intel Quick Sync video encoding
- More expensive at launch than the 2500K for negligible gains
- Lacks VT-d
- No Hyper-Threading
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 i5-2550K
- AMD Bulldozer FX-4170Rival
Desktop Enthusiast
- Compare head-to-headIntel Core i5-2500KRival
Desktop Enthusiast
- Intel Core i7-2600KRival
Desktop Premium
- AMD FX-6200Rival
Desktop Multi-thread
- Compare head-to-headIntel Core i5-3570KRival
Next-Gen Enthusiast
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 intriguing engineering footnote that disabled the iGPU for theoretical overclocking gains, but its minor clock bump and higher price over the 2500K made it one of the least relevant 'K' series processors Intel ever launched.
Best for: Purchasing as a collector's item to complete a Sandy Bridge CPU collection.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-2500K or Intel Core i5-2550K?
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 i5-2550K?
For gaming, the Intel Core i5-2550K leads with a gaming performance score of 23/100 among Intel Core i5-2500K and Intel Core i5-2550K.
Do Intel Core i5-2500K and Intel Core i5-2550K 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 i5-2550K posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-2500K (4,200), Intel Core i5-2550K (4,500). Benchmark figures are approximate and workload-dependent.