CPU Comparison
Core i7-875K vs Intel Core i5-750
A side-by-side comparison of specs, performance and value. The Intel Core i7-875K is an enthusiast desktop processor launched in May 2010, based on the 45nm Lynnfield architecture. It is notable for being Intel's first 'K-series' processor, featuring a fully unlocked multiplier. Operating at a base frequency of 2.933 GHz and boosting up to 3.6 GHz via Turbo Boost, it offers 4 cores and 8 threads. The unlocked multiplier was a significant shift in Intel's strategy, allowing enthusiasts to easily overclock via multiplier adjustments rather than relying solely on Base Clock (BCLK) tweaks. It utilizes the LGA 1156 socket and integrates a dual-channel DDR3 memory controller and 16 PCIe 2.0 lanes. With a 95W TDP, it shares the same physical characteristics as the i7-870 but with enhanced tuning capabilities. The 875K lacked a stock cooler, emphasizing its enthusiast focus. Although obsolete, it is a historically important CPU that democratized overclocking on the Intel platform.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Identical to i7-870 at stock, highly responsive when OC'd.
Four cores help with basic multitasking but modern productivity apps will feel sluggish.
Gaming
Handles old games well but bottlenecks modern titles.
With a discrete GPU, can handle older games but cannot run modern titles at acceptable frame rates due to CPU limitations.
Virtualization
Good for legacy VMs.
Four real cores provide usable virtualization for lightweight VMs.
Efficiency
95W TDP, but power draw increases heavily when overclocked.
95W for four 45nm cores is inefficient by modern standards.
Specialized Performance
AI / ML
- No AI hardware
- Unsuitable for modern inference
- No AI acceleration instructions
- Far too slow for any ML workload
Content Creation
Gaming
- PCIe 2.0 only
- No AVX support
- Requires 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
- 8MB L3 cache
- High turbo clock
- Historical significance
Cons
- Obsolete platform
- No integrated graphics
- No stock cooler
- DDR3 only
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
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.
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
A 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 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, Core i7-875K or Intel Core i5-750?
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, Core i7-875K or Intel Core i5-750?
For gaming, the Core i7-875K leads with a gaming performance score of 37/100 among Core i7-875K and Intel Core i5-750.
Do Core i7-875K and Intel Core i5-750 use the same socket?
No. They use different sockets (Core i7-875K: Intel Socket 1156, Intel Core i5-750: LGA 1156), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i5-750 posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-750 (6,750). Benchmark figures are approximate and workload-dependent.