CPU Comparison

Intel Core i7-6800K vs Core i7-7820X

A side-by-side comparison of specs, performance and value. The Intel Core i7-6800K is a high-end desktop (HEDT) processor built on the Broadwell-E architecture. Designed for enthusiasts and professionals, it features six cores and twelve threads, offering a significant multi-threaded performance leap over mainstream quad-core CPUs of its era. Operating at a base frequency of 3.4 GHz and boosting up to 3.8 GHz with Intel Turbo Boost Max 3.0, it delivers robust computing power for demanding applications. Unlike mainstream chips, it utilizes the LGA 2011-v3 socket and the X99 chipset, supporting quad-channel DDR4 memory for massive memory bandwidth. With 28 PCIe 3.0 lanes, it provides extensive expansion capabilities for multi-GPU setups and high-speed storage arrays. The 140-watt TDP reflects its workstation-class design. While it lacks integrated graphics, requiring a discrete GPU, the 6800K excels in parallel processing tasks like video editing, 3D rendering, and virtualization, making it a powerhouse for creators who need more than standard desktop platforms offer.

Intel · Core i7
Intel Core i7-6800K
6C / 12T3.8 GHz140 W
8
Full review
Intel · X-Series 7th Gen
Core i7-7820X
8C / 16T4.5 GHz140 W
8
Full review

The Bottom Line

Overview & Launch

Brand
Intel
Intel
Market
Desktop
Desktop
Segment
High-End Desktop
High-End Desktop
Generation
Core i7 (Broadwell-E)
7th Gen X-Series
Launched
2016
2017
Status
End-of-life
End-of-life
Codename
Broadwell-E
Skylake-X
Series
Core i7
X-Series 7th Gen
Family
6th Generation
Skylake-X
Predecessor
Intel Core i7-5820K
Core i7-6900K
Successor
Intel Core i7-7800X
Core i9-9800X

Specifications Compared

Cores & Clocks
Cores
6
8
Threads
12
16
Base Clock
3.4 GHz
3.6 GHz
Boost Clock
3.8 GHz
4.5 GHz
Cache & Power
L3 Cache
15 MB
11 MB
TDP
140 W
140 W
Architecture
Architecture
Broadwell-E
Skylake-X
Process Node
14nm
14nm
Memory
Memory Type
DDR4
DDR4
Memory Speed
2400 MT/s
2666 MT/s
Memory Channels
Quad (4)
Quad (4)
Max Memory
128 GB
128 GB
Platform & I/O
Socket
Intel Socket 2011-3
LGA 2066
PCIe Version
Gen 3
PCIe 3.0
PCIe Lanes
28
28
Integrated GPU
None
None
Unlocked
Yes
Yes

Performance Compared

Productivity

Intel Core i7-6800K75

6 cores handle rendering well, but lack the speed of modern architectures.

Core i7-7820X

Gaming

Intel Core i7-6800K65

Good for gaming, but single-core speed lags behind modern CPUs.

Core i7-7820X

Virtualization

Intel Core i7-6800K80

Quad-channel memory and 12 threads make it great for VMs.

Core i7-7820X

Efficiency

Intel Core i7-6800K40

140W TDP is power-hungry by modern standards.

Core i7-7820X

Specialized Performance

AI / ML

Intel Core i7-6800KLimited
  • No AI hardware
  • CPU inference is moderate due to core count
Core i7-7820X

No data

Content Creation

Intel Core i7-6800KVery Good
Premiere ProBlenderAutoCADDaVinci Resolve
Core i7-7820X

No data

Gaming

Intel Core i7-6800KGood
  • Can handle modern games with a discrete GPU
  • Lower single-core speed limits high-refresh gaming
  • Great for multi-tasking while gaming
Core i7-7820X

No data

Industry Impact

Gaming
Moderate
Moderate
Workstations
High
High
Content Creation
High
High
Virtualization
High
High

Best CPU by Use Case

4K Video Editing
Very Good
Excellent
3D Rendering
Very Good
Excellent
Virtual Machines
Excellent
1440p Gaming
Good
Compilation
Excellent

Target Audience

Gamers
Targeted
Content Creators
Targeted
Targeted
Developers
Targeted
Targeted
Workstation Users
Targeted
Targeted
Streamers
Targeted
Office / Productivity
Students

Strengths & Weaknesses

Intel Core i7-6800K

Pros

  • 6 cores / 12 threads
  • 28 PCIe lanes
  • Quad-channel memory
  • Unlocked for overclocking

Cons

  • High 140W TDP
  • Older 14nm process
  • Only 28 PCIe lanes
  • Lacks integrated graphics
Core i7-7820X

Pros

  • Strong 8-core multi-threaded performance
  • Turbo Boost Max 3.0 for high single-core bursts
  • Quad-channel memory support
  • AVX-512 support

Cons

  • High 140W TDP
  • Runs very hot (uses thermal paste)
  • Lacks integrated graphics
  • Expensive X299 platform

Competitors & Alternatives

Intel Core i7-6800K

Core i7-7820X

Our Verdict on Each

A solid entry point into the HEDT market, offering 6 cores and 28 PCIe lanes, though aging rapidly compared to modern alternatives.

Best for: Upgrading an existing X99 system for more cores.

Read the full review
Core i7-7820XSituational

An excellent 8-core HEDT processor for 2017, offering a great balance of frequency and core count, though it suffers from high thermals.

Best for: Used budget workstation build

Read the full review

Frequently Asked Questions

Which is faster for gaming, Intel Core i7-6800K or Core i7-7820X?

For gaming, the Intel Core i7-6800K leads with a gaming performance score of 65/100 among Intel Core i7-6800K and Core i7-7820X.

Do Intel Core i7-6800K and Core i7-7820X use the same socket?

No. They use different sockets (Intel Core i7-6800K: Intel Socket 2011-3, Core i7-7820X: LGA 2066), so each needs a compatible motherboard.

Which has more cores?

The Core i7-7820X has the most cores. Core counts: Intel Core i7-6800K (6 cores), Core i7-7820X (8 cores).

Which is faster in multi-core benchmarks?

The Intel Core i7-6800K posts the highest multi-core benchmark score. Multi-core results: Intel Core i7-6800K (13,000), Core i7-7820X (0). Benchmark figures are approximate and workload-dependent.