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Intel Core I9 9820X (9th Gen) processor
Intel

9th Gen Intel Core i9 9820X

View on NeweggView on intel.com
Boost/Base Clock:
4.2 GHz / 3.3 GHz
Core/Thread Count:
10 Core / 20 Thread
Cache:
16.5MB L3 + 10MB L2 + 640KB L1
TDP:
165 Watts
CPU Socket:
FCLGA2066
CPU Series:
Skylake-X, 9th Gen Intel Core
Memory Support:
DDR4-2666, non-ECC (ECC not supported)
Form Factor:
Server & Enthusiast

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Manufacturer: Intel Last updated: September 9, 2026

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9th Gen Intel Core i9 9820X Review

The 9th Gen Intel Core i9 9820X is a 10-core, 20-thread HEDT processor built on Skylake-X, running a 3.3 GHz base clock that boosts to 4.2 GHz within a 165 Watt TDP on the LGA2066 socket.

Sharing the same 10-core count as the 9900X but with a modestly lower boost ceiling, this chip offered a genuine alternate entry point into Intel's 9th Gen X-series HEDT stack.

Platform

This HEDT chip requires an X299-series motherboard on the LGA2066 socket, typically paired with quad-channel memory for genuine workstation-scale bandwidth.

How Is the Core i9 9820X in Terms of Performance

With 10 cores and 20 threads, this chip offers the HEDT platform's genuine memory bandwidth and PCIe lane advantages, sharing its core count with the 9900X at a modestly lower clock ceiling.

Benchmarks

As a genuine 10-core Skylake-X HEDT chip, this processor delivers solid workstation-tier multi-threaded throughput, tracking closely with the 9900X's core-count tier within Intel's 9th Gen X-series lineup.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Best for

  • Prosumer content creators wanting genuine 10-core HEDT platform capability

Not for

  • Buyers needing the highest core counts, the 9920X and 9960X offer more on the same platform

Specifications

What these specs mean

Identity

BrandIntel
Model Number9820X
Product FamilyCore i9
Release Year2018
SegmentHEDT

Cores and threads

Core Count10 cores
Thread Count20 threads
SMT SupportYes

Clocks

Base Clock3.3 GHz
Boost Clock4.1 GHz

Cache

L2 Cache10 MB
L3 Cache16.5 MB
3D V-CacheNo

Platform

SocketFCLGA2066
Multi-Socket SupportSingle Socket Only

Memory

Memory Channels4 channels
Max Memory Speed2666 MT/s
Max Memory Capacity0.125 TB
ECC SupportNo

PCIe and IO

PCIe Lanes44 lanes
PCIe GenerationPCIe 3.0
CXL SupportNone

Power and thermals

TDP165 W

Accelerators and security

Integrated GraphicsNo
AVX-512 SupportYes
AMX SupportNo

Manufacturing

Process Node14 nm
CPU SocketFCLGA2066

FAQs

What are the key specifications of the 9th Gen Intel Core i9 9820X?

The 9th Gen Intel Core i9 9820X has a 3.3 GHz base and 4.1 GHz boost clock, 16.5 MB of L3 cache and a 165 W TDP. It has no integrated graphics, so it needs a graphics card. Socket: FCLGA2066.

Will the 9th Gen Intel Core i9 9820X work with my current setup?

The 9th Gen Intel Core i9 9820X lists CPU Socket is FCLGA2066. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.

Who is the 9th Gen Intel Core i9 9820X best suited to?

Best suited to: Prosumer content creators wanting genuine 10-core HEDT platform capability.

What are the drawbacks of the 9th Gen Intel Core i9 9820X?

Not the best fit for: Buyers needing the highest core counts, the 9920X and 9960X offer more on the same platform.

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