CPU Comparison
Intel Core i7-6850K vs Intel Core i7-5820K
A side-by-side comparison of specs, performance and value. The Intel Core i7-6850K is a high-end desktop processor that occupies the middle tier of the Broadwell-E lineup. Engineered for demanding enthusiasts and professional creators, it features six cores and twelve threads, providing substantial parallel processing power. It operates at a base clock of 3.6 GHz and can boost up to 4.0 GHz using Intel Turbo Boost Max 3.0, ensuring snappy single-threaded performance when needed. Unlike the entry-level 6800K, the 6850K offers a full 40 PCIe 3.0 lanes, unlocking maximum expansion potential for quad-GPU setups or massive NVMe storage arrays. It utilizes the LGA 2011-v3 socket and supports quad-channel DDR4 memory, delivering up to 76.8 GB/s of bandwidth. With a 140-watt TDP, it is a power-hungry chip designed for robust cooling. Lacking integrated graphics, it targets users who rely on discrete GPUs, excelling in complex 3D rendering, heavy video editing, and intensive virtualization environments where PCIe lanes and memory bandwidth are critical bottlenecks.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
6 cores handle heavy rendering well, but lack modern IPC.
Solid performance for older software and moderate rendering tasks, but falls behind modern 6-core CPUs in IPC and clock speed.
Gaming
Good for 60fps gaming, but single-core speed limits high-refresh performance.
Playable in modern esports and AAA titles when paired with a strong GPU, but likely to bottleneck top-tier cards in CPU-intensive scenarios.
Virtualization
40 PCIe lanes and 12 threads make it excellent for VMs.
Excellent value for home labs due to high core count, VT-d support, and PCIe lane availability for multiple NICs or storage controllers.
Efficiency
140W TDP is power-hungry by modern standards.
High power consumption (140W TDP) and heat output compared to 14nm, 10nm, or 7nm counterparts.
Specialized Performance
AI / ML
- No AI hardware
- CPU inference is moderate due to core count
- No dedicated AI or matrix acceleration hardware.
- AVX2 support offers some vector compute capability.
Content Creation
Gaming
- Can handle modern games with a discrete GPU
- Lower single-core speed limits high-refresh gaming
- Great for multi-tasking while gaming
- Requires discrete graphics; no integrated GPU.
- PCIe 3.0 lanes limit full potential of modern RTX 40-series GPUs.
- Boost clocks are modest by modern standards.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- 6 cores / 12 threads
- Full 40 PCIe lanes
- Quad-channel memory
- Unlocked for overclocking
Cons
- High 140W TDP
- Older 14nm process
- Lacks integrated graphics
- Expensive on the used market
Pros
- Relatively low entry cost for a used HEDT platform
- Quad-channel DDR4 memory support
- 28 PCIe lanes allow for multiple expansion cards
- Unlocked for overclocking
- Strong multi-core performance for its era
Cons
- High power draw and heat output
- No integrated graphics
- Limited to 28 PCIe lanes (fewer than 5930K/5960X)
- Requires expensive X99 motherboards and DDR4 RAM
- Older architecture lacks modern instruction sets like AVX-512
Competitors & Alternatives
Intel Core i7-6850K
- AMD Ryzen 7 1800XRival
High-End Desktop
- Compare head-to-headIntel Core i7-6800KRival
High-End Desktop
- Compare head-to-headIntel Core i7-5930KRival
High-End Desktop
- AMD Ryzen 7 1700XRival
High-End Desktop
- Compare head-to-headIntel Core i7-7820XRival
High-End Desktop
Offers 8 cores for more multi-threaded power.
Compare head-to-head- AMD Ryzen 5 5600XAlt
Vastly superior single-core speed and efficiency.
- Intel Core i5-12400FAlt
Modern alternative that beats it in almost everything.
- AMD Ryzen 7 5700XAlt
8 cores, better IPC, lower power.
Intel Core i7-5820K
- AMD Ryzen 5 1600Rival
Mainstream
- AMD Ryzen 7 1700Rival
Creator
- Compare head-to-headIntel Core i7-4790KRival
Gaming
- AMD FX-9590Rival
Enthusiast
- Compare head-to-headIntel Core i7-6800KRival
Workstation
If you need the full 40 PCIe lanes for tri-SI or heavy storage arrays.
Compare head-to-head- AMD Ryzen 5 5600Alt
A modern, significantly faster and more efficient gaming CPU.
Modern platform with PCIe 5.0 and DDR5 support.
Compare head-to-head- AMD Ryzen 9 5900XAlt
Massive multi-core performance jump for content creation.
More cores and higher frequency on a still-recent mainstream platform.
Compare head-to-head
Our Verdict on Each
An excellent HEDT chip for its time, offering 40 PCIe lanes and strong multi-core performance, though outclassed by modern hardware.
Best for: Upgrading an X99 system for maximum PCIe expansion.
Read the full reviewThe i7-5820K was a groundbreaking value proposition in 2014, bringing DDR4 and quad-channel memory to a lower price point. Today, it remains viable only for budget builds, handicapped by high power consumption and limited PCIe lanes compared to modern standards.
Best for: Building a budget-friendly used workstation for virtualization or light content creation.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i7-6850K or Intel Core i7-5820K?
Based on our editorial ratings, the Intel Core i7-6850K comes out ahead with a score of 8.2/10. 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 i7-6850K or Intel Core i7-5820K?
For gaming, the Intel Core i7-6850K leads with a gaming performance score of 68/100 among Intel Core i7-6850K and Intel Core i7-5820K.
Do Intel Core i7-6850K and Intel Core i7-5820K use the same socket?
No. They use different sockets (Intel Core i7-6850K: Intel Socket 2011-3, Intel Core i7-5820K: FCLGA2011-3 (LGA2011-v3)), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i7-6850K posts the highest multi-core benchmark score. Multi-core results: Intel Core i7-6850K (13,500). Benchmark figures are approximate and workload-dependent.