Intel · Core

Core i9-9940X

Released 2018

An unlocked 14-core Skylake-X refresh desktop processor with Hyper-Threading and four-channel DDR4 memory for LGA2066 enthusiast systems.

Model history · 2 models, 2017–2018

Specifications

Cores: 14
Threads: 28
Base clock: 3.3 GHz
Boost clock: 4.5 GHz
L3 cache: 19.25 MB
Cores: Skylake-X refresh; Hyper-Threading and an unlocked multiplier, confirmed by Intel’s exact-model launch table.
Clocks: Turbo Boost Max 3.0 up to 4.50 GHz on the preferred cores; ordinary Turbo Boost 2.0 up to 4.40 GHz. Intel planned November 2018 availability. ASCII’s contemporary report confirms Japanese retail sale on 21 December 2018, but earlier worldwide sale was not established; year precision is retained.
Cache: 19.25 MB Intel Smart Cache; L3 designation confirmed by the exact Newegg listing.

Built-in graphics: No
Graphics: No processor graphics, explicitly confirmed by Intel’s exact-model support table.

Socket: LGA2066
Base power: 165 W
Unlocked: Yes
Cooler in the box: No
Memory support: Up to 128 GB; four channels of DDR 4-2666; 85 GB/s maximum published bandwidth; no ECC.
PCIe: 44 CPU lanes; PCIe 3.0. The 68-lane family platform figure includes chipset lanes.
Chipsets: Intel X 299; LGA 2066.
Process: 14 nm; Skylake-X refresh.
Cooler: Intel explicitly excludes a fan and heatsink from the boxed product. Intel’s support article confirms solder thermal interface material for this exact model; published junction limit 88°C.

Closest rivals

Model	Cores	Boost	L3	Power	Socket	Released
AMDRyzen Threadripper 2950X	16/32	4.4 GHz	32 MB	180 W	sTR4	Aug 2018
AMDRyzen Threadripper 2920X	12/24	4.3 GHz	32 MB	180 W	sTR4	Oct 2018
IntelCore i9-9960X	16/32	4.5 GHz	22 MB	165 W	LGA2066	2018

Previous model: Core i9-7940X. Newer model: Core i9-10940X.