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Intel Core I9 9940X (9th Gen) processor
Intel

9th Gen Intel Core i9-9940X

View on NeweggView on intel.com
Boost/Base Clock:
4.5 GHz / 3.3 GHz
Core/Thread Count:
14 Core / 28 Thread
Cache:
19.25MB L3 + 14MB L2 + 896KB L1
TDP:
165 Watts
CPU Process Node:
14 Nanometers
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 i9-9940X Review

The 9th Gen Intel Core i9-9940X is a 14-core, 28-thread HEDT processor built on Skylake-X, running a 3.3 GHz base clock that boosts to 4.5 GHz within a 165 Watt TDP on the LGA2066 socket.

Sitting between the 12-core 9920X and 16-core 9960X in Intel's 9th Gen X-series stack, this chip offered a genuine mid-tier core count option for prosumer workstation buyers.

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 i9-9940X in Terms of Performance

With 14 cores and 28 threads, this chip targets demanding workstation and content-creation workloads, offering a genuine mid-tier core count within Intel's 9th Gen X-series stack between the 9920X and 9960X.

Benchmarks

As a genuine 14-core Skylake-X HEDT chip with a strong 4.5 GHz boost ceiling, this processor delivers solid workstation-tier multi-threaded throughput at Intel's 9th Gen X-series mid-tier core count.

Our verdict

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

Best for

  • Prosumer workstation workloads wanting a mid-tier core count balance within Intel's 9th Gen X-series HEDT stack

Not for

  • Buyers with more modest core-count needs, the 9900X or 9920X offer HEDT platform features at a lower price

Specifications

What these specs mean

Identity

BrandIntel
Model Number9940X
Product FamilyCore i9
Release Year2018
SegmentHEDT

Cores and threads

Core Count14 cores
Thread Count28 threads
SMT SupportYes

Clocks

Base Clock3.3 GHz
Boost Clock4.4 GHz

Cache

L2 Cache14 MB
L3 Cache19.25 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 i9-9940X?

The 9th Gen Intel Core i9-9940X has a 3.3 GHz base and 4.4 GHz boost clock, 19.25 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 i9-9940X work with my current setup?

The 9th Gen Intel Core i9-9940X 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 i9-9940X best suited to?

Best suited to: Prosumer workstation workloads wanting a mid-tier core count balance within Intel's 9th Gen X-series HEDT stack.

What are the drawbacks of the 9th Gen Intel Core i9-9940X?

Not the best fit for: Buyers with more modest core-count needs, the 9900X or 9920X offer HEDT platform features at a lower price.

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