CPU Comparison
Intel Core i5-6600K vs Intel Core i7-6700K
A side-by-side comparison of specs, performance and value. The Intel Core i5-6600K is an unlocked 4-core, 4-thread Skylake desktop processor designed specifically for enthusiasts and gamers who wanted robust overclocking capabilities on the Z170 platform.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Lacks hyper-threading, making it slow for modern multi-threaded productivity workloads.
Good for general tasks, but 4 cores struggle with heavy rendering.
Gaming
Bottlenecks modern GPUs in CPU-heavy titles due to 4 threads, but adequate for older or eSports games.
Still handles 60fps gaming well, but quad-core limitations show in modern CPU-heavy titles.
Virtualization
Very limited for VMs due to low thread count and lack of ECC support.
Okay for light VMs, but limited by core count.
Efficiency
14nm Skylake was efficient for its time, but 91W TDP is high by today's standards for 4 cores.
91W TDP is manageable, but power draw increases significantly when overclocked.
Specialized Performance
AI / ML
- No AI acceleration hardware
- 4 threads severely limit local inference capabilities
- No AI hardware
- CPU inference is slow due to core count
Content Creation
Gaming
- Struggles in modern AAA games that use 6+ threads
- Great for eSports titles like CS:GO and Valorant
- Overclocking helps maintain minimum frame rates
- Can handle 60fps gaming with a mid-range GPU
- Struggles with high-refresh-rate modern titles
- Excellent for retro and esports gaming
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Unlocked multiplier for easy overclocking
- Solid IPC for its generation
- Integrated HD 530 graphics for troubleshooting
- Supports DDR4 memory
- Great overclocking headroom (often hit 4.5-4.7GHz)
Cons
- Only 4 threads without Hyper-Threading
- 91W TDP is relatively high for a 4-core processor
- End-of-life platform with no upgrade path
- Struggles with modern gaming workloads
- Requires discrete GPU for any serious gaming
- Does not include a stock cooler
Pros
- Unlocked for overclocking
- High 4.0 GHz base clock
- Supports DDR4 memory
- Strong single-core performance
Cons
- Only 4 cores
- Runs hot when overclocked
- Uses thermal paste under IHS
- Older 14nm process
Competitors & Alternatives
Intel Core i5-6600K
- AMD FX-8350Rival
Enthusiast
- AMD FX-6350Rival
Budget
- Compare head-to-headIntel Core i7-6700KRival
High-End Desktop
- Compare head-to-headIntel Core i5-4690KRival
Mainstream
- AMD Ryzen 5 1400Rival
Mainstream
Modern architecture, much better gaming and multi-threaded performance.
Compare head-to-head- AMD Ryzen 5 5600Alt
6 cores/12 threads, far superior for modern games and productivity.
- Intel Core i5-12400FAlt
Incredible budget performance on a modern platform with great single-core speed.
- AMD Ryzen 5 3600Alt
Great used market value, PCIe 4.0 support, and 12 threads.
Cheaper modern alternative with similar or better single-core performance today.
Compare head-to-head
Intel Core i7-6700K
- AMD FX-8370Rival
Desktop Enthusiast
- AMD FX-9590Rival
Desktop Enthusiast
- Compare head-to-headIntel Core i7-4790KRival
Desktop Enthusiast
- Compare head-to-headIntel Core i5-6600KRival
Desktop Enthusiast
- AMD FX-8350Rival
Desktop Enthusiast
- Intel Core i7-7700KAlt
Successor with slightly better clocks and IPC.
- Intel Core i5-12400FAlt
Vastly superior modern alternative for budget builds.
- AMD Ryzen 5 5500Alt
More cores, better modern value.
Cheaper, 6 cores, better performance.
Compare head-to-head- AMD Ryzen 5 3600Alt
Legacy alternative with much better multi-threading.
Our Verdict on Each
A legendary overclocker in its day, the i5-6600K brought DDR4 and PCIe 3.0 to the mainstream, though its 4-thread limitation shows its age in modern titles.
Best for: The Intel Core i5-6600K is only recommended today if you already own an LGA 1151 motherboard and DDR4 memory, and you are looking for a drop-in upgrade or replacement for a broken Pentium or i3 on a strict zero-budget. It can still handle everyday web browsing, office tasks, and esports titles like CS:GO or Valorant reasonably well. If you are building a system from scratch, there is absolutely no reason to purchase this processor new. Modern entry-level CPUs like the i3-12100F or Ryzen 5 5600 dramatically outperform it in every metric while offering a viable upgrade path. The used market is the only place this chip makes sense, and even then, you should avoid paying more than a fraction of its original launch price due to its heavily constrained multi-threading capability and dead-end platform status.
Read the full reviewAn iconic processor that brought DDR4 to the mainstream, offering incredible overclocking headroom and gaming performance that still holds up for basic use.
Best for: Upgrading an existing LGA 1151 system for budget 1080p gaming.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-6600K or Intel Core i7-6700K?
Based on our editorial ratings, the Intel Core i7-6700K 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 i5-6600K or Intel Core i7-6700K?
For gaming, the Intel Core i7-6700K leads with a gaming performance score of 75/100 among Intel Core i5-6600K and Intel Core i7-6700K.
Do Intel Core i5-6600K and Intel Core i7-6700K use the same socket?
No. They use different sockets (Intel Core i5-6600K: LGA 1151, Intel Core i7-6700K: Intel Socket 1151), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i7-6700K posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-6600K (5,800), Intel Core i7-6700K (8,500). Benchmark figures are approximate and workload-dependent.