CPU Comparison
Intel Core i7-6900K vs Intel Core i7-7820X
A side-by-side comparison of specs, performance and value. The Intel Core i7-6900K is a formidable high-end desktop processor built on the Broadwell-E architecture, designed for extreme enthusiasts and professional content creators. Featuring eight cores and sixteen threads, it delivers massive multi-threaded processing power for the most demanding workloads. It operates at a base clock of 3.2 GHz and utilizes Intel Turbo Boost Max 3.0 to dynamically push frequencies up to 4.0 GHz on the fastest core, balancing raw parallel performance with responsive single-threaded speed. The processor leverages the LGA 2011-v3 socket, supporting quad-channel DDR4 memory for unparalleled memory bandwidth. With a full 40 PCIe 3.0 lanes, it supports expansive multi-GPU configurations and high-speed NVMe RAID arrays without bandwidth bottlenecks. Its 20 MB of L3 cache ensures efficient data handling across all eight cores. The 140-watt TDP requires robust cooling, but the payoff is exceptional performance in 3D rendering, complex video editing, and heavy virtualization scenarios, making it a true workstation powerhouse.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
8 cores handle heavy rendering excellently, but lack modern IPC.
Strong multi-threaded throughput in CINEBENCH, HandBrake, and similar workloads at launch; still competent for many content creation tasks compared to modern mainstream parts.
Gaming
Good for 60fps gaming, but single-core speed limits high-refresh performance.
Delivers high frame rates in 2017-era titles and remains adequate for modern gaming, but newer gaming-focused CPUs with higher clocks and improved IPC pull ahead.
Virtualization
40 PCIe lanes and 16 threads make it perfect for VMs.
PCIe and memory bandwidth are helpful for multiple VMs, but core count is moderate for modern heavy virtualization needs.
Efficiency
140W TDP is power-hungry by modern standards.
High 140 W TDP and 14 nm process lead to greater power consumption versus newer 7 nm and smaller nodes.
Specialized Performance
AI / ML
- No AI hardware
- CPU inference is good due to core count
- No dedicated AI acceleration hardware
- AVX-512 can help certain CPU-bound inference tasks
- Most modern AI workloads are better served by GPUs
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
- Capable of high-refresh gaming with a strong GPU
- Single-core boost reaches up to 4.5 GHz on favored cores
- Modern CPUs offer better gaming efficiency and higher IPC
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- 8 cores / 16 threads
- Full 40 PCIe lanes
- Quad-channel memory
- 20 MB L3 cache
Cons
- High 140W TDP
- Older 14nm process
- Lacks integrated graphics
- Expensive on the used market
Pros
- 8 cores and 16 threads for multi-threaded workloads
- Quad-channel DDR4 memory increases bandwidth
- 28 PCIe 3.0 lanes plus chipset lanes for expansion
- Turbo Boost Max 3.0 for higher single-core boosts
- AVX-512 support for optimized workloads
- Unlocked multiplier for overclocking
Cons
- High 140 W TDP and power consumption
- No integrated graphics
- Only 28 CPU PCIe lanes, limiting multi-GPU configurations
- Discontinued platform with limited future upgrades
- Older 14 nm process versus modern smaller nodes
Competitors & Alternatives
Intel Core i7-6900K
- AMD Ryzen 7 1800XRival
High-End Desktop
- Compare head-to-headIntel Core i7-5960XRival
High-End Desktop
- Compare head-to-headIntel Core i7-6850KRival
High-End Desktop
- AMD Ryzen Threadripper 1900XRival
High-End Desktop
- Intel Core i9-7820XRival
High-End Desktop
Offers 10 cores for even more multi-threaded power.
Compare head-to-head- AMD Ryzen 7 5800XAlt
Vastly superior single-core speed and efficiency.
Modern alternative that beats it in almost everything.
Compare head-to-head- AMD Ryzen 9 5900XAlt
12 cores, better IPC, lower power.
Intel Core i7-7820X
- AMD Ryzen 7 1800XRival
Creator/Gaming
- AMD Ryzen 7 1700XRival
Creator/Gaming
- AMD Ryzen Threadripper 1920XRival
Workstation
- AMD Ryzen Threadripper 1950XRival
Workstation
- RivalCompare head-to-head
More cores, higher efficiency, and DDR5 on a modern mainstream platform.
Compare head-to-head- AMD Ryzen 9 7900Alt
Strong multi-threaded performance with excellent efficiency.
- AMD Ryzen 9 5900XAlt
12-core AM4 option with strong gaming and creator performance.
High-performance mainstream platform with good upgrade path.
Compare head-to-head- AMD Ryzen Threadripper 2950X (used)Alt
Higher core and lane count for workstation-class workloads.
Our Verdict on Each
An incredible 8-core HEDT processor for its time, offering massive multi-threaded power, though modern mainstream CPUs now match or exceed it.
Best for: Upgrading an X99 system for maximum multi-core rendering.
Read the full reviewA competent eight-core HEDT chip with strong multi-threaded performance and platform expansion, though high power draw and limited PCIe lanes compared to higher-tier X299 CPUs make it a niche choice today.
Best for: Used-market upgrade for an existing X299 build with quad-channel DDR4 and a need for more cores than mainstream.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i7-6900K or Intel Core i7-7820X?
Based on our editorial ratings, the Intel Core i7-6900K 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 i7-6900K or Intel Core i7-7820X?
For gaming, the Intel Core i7-7820X leads with a gaming performance score of 78/100 among Intel Core i7-6900K and Intel Core i7-7820X.
Do Intel Core i7-6900K and Intel Core i7-7820X use the same socket?
No. They use different sockets (Intel Core i7-6900K: Intel Socket 2011-3, Intel Core i7-7820X: LGA2066), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i7-6900K posts the highest multi-core benchmark score. Multi-core results: Intel Core i7-6900K (17,000). Benchmark figures are approximate and workload-dependent.