Quick Verdict
An excellent 8-core HEDT processor for 2017, offering a great balance of frequency and core count, though it suffers from high thermals.
Overview
Launch
2017
Status
End-of-lifeGeneration
7th Gen X-Series
Market
Desktop
The Intel Core i7-7820X is a high-end desktop processor launched in June 2017, occupying the sweet spot in Intel's Skylake-X lineup. Built on the 14nm process for the LGA 2066 socket, it features 8 cores and 16 threads, providing substantial multi-threaded horsepower for professional workloads. It operates at a base clock of 3.6 GHz and utilizes Intel Turbo Boost Max 3.0 to reach up to 4.5 GHz on its fastest core, delivering excellent single-threaded bursts. With a 140W TDP, it demands robust cooling and a high-quality X299 motherboard. The processor features 11MB of L3 cache and 1MB of L2 cache per core. It supports quad-channel DDR4-2666 memory, offering massive bandwidth, and includes 28 PCIe 3.0 lanes for extensive expansion. Lacking integrated graphics, it targets content creators, 3D artists, and enthusiasts who require significant parallel processing power and platform expansion for rendering, compilation, and virtualization tasks.
The Core i7-7820X was the sweet spot of the Skylake-X lineup. With 8 cores boosting up to 4.5 GHz via Turbo Boost 3.
0, it handles heavy rendering and compilation well. Its quad-channel memory and 28 PCIe lanes make it a solid foundation for a workstation.
Specifications
Performance
Architecture
14nm
Process Node
Skylake-X
Codename
8C / 16T
Core Config
11 MB
L3 Cache
140 W
TDP
Architecture Overview
The Core i7-7820X is built on the Skylake-X microarchitecture, utilizing Intel's 14nm process. It features 8 physical cores with Hyper-Threading, enabling 16 concurrent threads. A key architectural feature is the inclusion of Intel Turbo Boost Max 3.0, which identifies the single fastest core on the die and pushes it to 4.5 GHz, providing a significant single-threaded advantage over the base 4.3 GHz all-core turbo. The cache structure is unique, featuring 11MB of shared L3 cache and a large 8MB of distributed L2 cache (1MB per core). It supports quad-channel DDR4-2666 memory, maximizing throughput for memory-bound applications. The processor offers 28 PCIe 3.0 lanes and supports AVX-512 instructions, accelerating specialized floating-point workloads. Like other HEDT parts, it lacks integrated graphics, relying entirely on discrete GPUs.
CPU Design
8 cores, 16 threads, unlocked, Turbo Boost 3.0.
Memory Subsystem
Quad-channel DDR4-2666.
PCIe & I/O
28 PCIe 3.0 lanes.
Overclocking
Fully unlocked multiplier.
- Higher clock speeds
- Turbo Boost Max 3.0 support
- AVX-512 support
Key Highlights
- Strong 8-core multi-threaded performance
- Turbo Boost Max 3.0 for high single-core bursts
- Quad-channel memory support
- AVX-512 support
- High 140W TDP
- Runs very hot (uses thermal paste)
- Lacks integrated graphics
- Expensive X299 platform
History
The Core i7-7820X launched in June 2017 as the most balanced offering in Intel's initial Skylake-X rollout. Positioned at $599, it offered 8 cores and 16 threads, hitting a sweet spot for creators who needed serious multi-threaded performance without paying the premium for the 10-core i9-7900X. Crucially, it was the lowest-tier CPU in the lineup to include Intel Turbo Boost Max 3.
0, a feature that dynamically identified the fastest core and pushed it to 4.5 GHz, significantly improving single-threaded responsiveness. The 7820X was highly regarded for bridging the gap between high-frequency gaming and heavy-duty rendering.
However, it shared the same thermal issues as the rest of the Skylake-X family. The 14nm die produced significant heat, and Intel's use of thermal paste under the IHS meant the chip would throttle under heavy AVX loads unless delidded. Regardless, it remained a popular choice for workstation enthusiasts until Cascade Lake-X refreshed the platform in 2019.
Improvements over Previous Generation
- Higher clock speeds
- Turbo Boost Max 3.0 support
- AVX-512 support
Alternatives & Competitors
Should You Buy It?
Not Recommended for the right buyer
Used budget workstation build
Avoid if…
- Building a gaming PC
- You want high efficiency
- You need PCIe 4.0/5.0
Use Cases
Interesting Facts
It was the first Core i7 to feature Turbo Boost Max 3.0.
Officially supports DDR4-2666, higher than the 7800X's 2400 MT/s.
Launched at $599.
Features 11 MB of L3 cache.
Has a Tjmax of 99°C.
Requires a discrete GPU.
The 7820X is essentially a binned version of the i9-7900X.
Supports AVX-512 instructions.
Often delidded by enthusiasts to fix thermal issues.
Memory bandwidth is up to 85.3 GB/s.
People Also Ask
Is the i7-7820X good for gaming?
It is capable, but mainstream CPUs with higher single-core clocks and lower latency are better for pure gaming.
Does the i7-7820X support Turbo Boost 3.0?
Yes, it can boost its fastest core up to 4.5 GHz using Turbo Boost Max 3.0.
What is the TDP of the i7-7820X?
It has a Thermal Design Power (TDP) of 140 Watts.
Does the i7-7820X have integrated graphics?
No, it requires a discrete graphics card.
How many PCIe lanes does the i7-7820X have?
It has 28 PCIe 3.0 lanes.
Can the i7-7820X be overclocked?
Yes, it features an unlocked multiplier.
What memory speed does it support?
It officially supports quad-channel DDR4-2666.
What is the all-core turbo boost?
The all-core turbo boost is 4.3 GHz.
Does the i7-7820X support AVX-512?
Yes, it supports AVX-512 instructions.
What socket does the i7-7820X use?
It uses the Intel LGA 2066 socket.
Frequently Asked Questions
What is the base clock of the i7-7820X?
The base clock is 3.6 GHz.
Does it support Optane Memory?
Yes, it supports Intel Optane Memory.
Can it run Windows 11?
Officially unsupported, but workarounds exist.
What is the L3 cache size?
It has 11 MB of L3 cache.
Is the i7-7820X soldered?
No, it uses thermal paste, which causes high temperatures.
What is the Tjmax?
The maximum junction temperature is 99°C.
Does it support Hyper-Threading?
Yes, it has 8 cores and 16 threads.
What is the L2 cache size?
It has 1 MB of L2 cache per core (8 MB total).
Is it good for streaming?
Yes, 16 threads make it excellent for heavy streaming and encoding.
Does it come with a cooler?
No, it does not include a stock cooler.