CPU Comparison
Intel Core i5-655K vs Intel Core i5-750
A side-by-side comparison of specs, performance and value. The Intel Core i5-655K is an unlocked dual-core Clarkdale processor launched in May 2010, offering BCLK multiplier freedom for enthusiast overclockers on the LGA 1156 platform.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Two cores are fundamentally insufficient for any modern productivity workload.
Four cores help with basic multitasking but modern productivity apps will feel sluggish.
Gaming
Even overclocked, the dual-core architecture and weak iGPU make modern gaming impossible.
With a discrete GPU, can handle older games but cannot run modern titles at acceptable frame rates due to CPU limitations.
Virtualization
Minimal utility with only two cores and 4GB-friendly memory limits.
Four real cores provide usable virtualization for lightweight VMs.
Efficiency
73W base TDP increases significantly when overclocked, resulting in poor efficiency.
95W for four 45nm cores is inefficient by modern standards.
Specialized Performance
AI / ML
- No AI acceleration capabilities
- Completely unsuitable for any machine learning task
- No AI acceleration instructions
- Far too slow for any ML workload
Content Creation
Gaming
- Overclocking does not overcome the dual-core limitation
- HD Graphics at 733MHz cannot handle any modern 3D workload
- Was marginal for 2010 gaming even with a discrete GPU
- Cannot run modern AAA games at playable frame rates
- With a capable discrete GPU, older titles (pre-2015) run adequately
- The 2.666GHz base clock is a significant bottleneck
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Unlocked multiplier was rare and valuable for LGA 1156 overclocking
- 32nm process allowed impressive frequency headroom
- Interesting piece of Intel's overclocking history
- BCLK-independent overclocking simplified tuning
Cons
- Only two cores even when overclocked
- More expensive than the identical-performance i5-650 at launch
- Clarkdale's dual-die design limited memory controller performance
- No practical use in modern computing
- Overclocking a dual-core provides negligible real-world benefit today
Pros
- Four real cores provided strong 2009-era performance
- 8MB L3 cache was generous for the price
- Turbo boost significantly improved single-threaded performance
- Excellent value that redefined mainstream desktop pricing
- Overclockable via BCLK with good headroom
Cons
- No Hyper-Threading limits multi-threaded vs i7 Lynnfield
- No integrated graphics requires a discrete GPU
- 45nm process is obsolete
- No AVX instruction support
- LGA 1156 platform is dead with no upgrade path
Competitors & Alternatives
Intel Core i5-655K
- AMD Phenom II X2 560 Black EditionRival
Unlocked Dual-Core
- AMD Phenom II X4 955 Black EditionRival
Unlocked Quad-Core
- Compare head-to-headIntel Core i5-750Rival
Mainstream Quad-Core
- Intel Core i7-860Rival
Lynnfield i7
- AMD Athlon II X4 645Rival
Budget Quad-Core
- AMD Phenom II X4 955 BEAlt
Unlocked quad-core at a competitive price with better multi-threaded throughput.
- Intel Core i7-870Alt
Eight threads on the same platform if budget allowed.
Intel Core i5-750
- AMD Phenom II X4 965Rival
Quad-Core Desktop
- AMD Phenom II X4 955Rival
Quad-Core Desktop
- Compare head-to-headIntel Core i7-920Rival
High-End Desktop
- AMD Phenom II X6 1055TRival
Six-Core Desktop
- Intel Core 2 Quad Q9650Rival
Legacy Quad-Core
- Intel Core i7-860Alt
Eight threads via Hyper-Threading for better multi-threaded performance.
Higher clock speed on the same platform for a small premium.
Compare head-to-head
Our Verdict on Each
An interesting novelty for overclockers in 2010, but the unlocked multiplier on a dual-core Clarkdale offered little practical value even at launch.
Best for: Collectors or overclocking hobbyists interested in legacy hardware
Read the full reviewA landmark processor that offered excellent quad-core value in 2009-2010. Completely obsolete today but historically significant as the processor that established the Core i5 brand.
Best for: Keeping an existing LGA 1156 Lynnfield system functional for light tasks
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-655K or Intel Core i5-750?
Based on our editorial ratings, the Intel Core i5-750 comes out ahead with a score of 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 i5-655K or Intel Core i5-750?
For gaming, the Intel Core i5-750 leads with a gaming performance score of 12/100 among Intel Core i5-655K and Intel Core i5-750.
Which uses less power?
The Intel Core i5-655K has the lowest rated TDP. Power draw across these chips: Intel Core i5-655K (73 W), Intel Core i5-750 (95 W).
Do Intel Core i5-655K and Intel Core i5-750 use the same socket?
Yes — all of these CPUs use the LGA 1156 socket, so they share compatible motherboards.
Which has more cores?
The Intel Core i5-750 has the most cores. Core counts: Intel Core i5-655K (2 cores), Intel Core i5-750 (4 cores).
Which is faster in multi-core benchmarks?
The Intel Core i5-750 posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-655K (4,380), Intel Core i5-750 (6,750). Benchmark figures are approximate and workload-dependent.