CPU Comparison
Intel Core i5-2500K vs Core i7-875K
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.
Identical to i7-870 at stock, highly responsive when OC'd.
Gaming
When overclocked to 4.5 GHz+, it can still handle older esports titles, but is heavily bottlenecked in modern CPU-intensive games.
Handles old games well but bottlenecks modern titles.
Virtualization
Lacks VT-d, which limits advanced virtualization passthrough configurations, though basic VT-x works fine.
Good for legacy VMs.
Efficiency
When overclocked, power consumption can easily exceed 150 W, making it highly inefficient by modern standards.
95W TDP, but power draw increases heavily when overclocked.
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
- Unsuitable for modern 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
- PCIe 2.0 only
- No AVX support
- Requires discrete GPU
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
- Unlocked multiplier
- 8MB L3 cache
- High turbo clock
- Historical significance
Cons
- Obsolete platform
- No integrated graphics
- No stock cooler
- DDR3 only
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.
Core i7-875K
- AMD Phenom II X4 965 Black EditionRival
Desktop Enthusiast
- Intel Core i7-870Rival
Desktop High-End
- Compare head-to-headIntel Core i5-750Rival
Desktop Mainstream
- Compare head-to-headIntel Core i7-920Rival
Desktop High-End
- AMD Phenom II X6 1090TRival
Desktop Enthusiast
The true successor, massively better OC potential.
Compare head-to-head- AMD Phenom II X4 965 BEAlt
AMD's unlocked alternative.
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 groundbreaking CPU that brought unlocked multipliers to the mainstream, making overclocking accessible. Still obsolete but legendary.
Best for: Legacy LGA 1156 overclocking project.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-2500K or Core i7-875K?
Based on our editorial ratings, the Core i7-875K comes out ahead with a score of 8.5/10. 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 Core i7-875K?
For gaming, the Core i7-875K leads with a gaming performance score of 37/100 among Intel Core i5-2500K and Core i7-875K.
Do Intel Core i5-2500K and Core i7-875K use the same socket?
No. They use different sockets (Intel Core i5-2500K: LGA 1155, Core i7-875K: Intel Socket 1156), so each needs a compatible motherboard.
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). Benchmark figures are approximate and workload-dependent.