Intel Core i5-14400F vs Intel Core i9-7940X

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Core i5-14400F compared with Core i9-7940X

	IntelCore i5-14400F	IntelCore i9-7940X
Overview
Released
Released	January 2024	September 2017
Cores and clocks
Cores
Cores	10 (6 performance, 4 efficiency)	14 (better)
Threads
Threads	16	28 (better)
Base clock
Base clock	2.5 GHz	3.1 GHz
Boost clock
Boost clock	4.7 GHz (better)	4.4 GHz
L3 cache
L3 cache	20 MB (better)	19.25 MB
Cores
Cores	6 Performance-cores and 4 Efficient-cores, with Hyper-Threading; codename Raptor Lake	Skylake-X; 14 cores with Hyper-Threading. The unlocked multiplier is confirmed by Intel’s exact-model family product brief.
Clocks
Clocks	P-core base 2.5 GHz, max turbo 4.7 GHz; E-core base 1.8 GHz, max turbo 3.5 GHz	Turbo Boost Max 3.0 up to 4.40 GHz on the preferred core; ordinary Turbo Boost 2.0 up to 4.30 GHz. The main boost field uses Intel’s highest published frequency. Intel’s August family notice explicitly states that the new fourteen- to eighteen-core processors would be available on 25 September 2017; Puget’s contemporary exact-model tests confirm availability that day.
Cache
Cache	20 MB Intel Smart Cache (L3); 9.5 MB L2	19.25 MB Intel Smart Cache (L3).
Graphics and AI
Built-in graphics
Built-in graphics	No	No
Graphics
Graphics	None; a graphics card is required	No processor graphics, explicitly stated in Intel’s exact-model comparison-chart row; a separate graphics solution is required.
Platform
Socket
Socket	LGA1700	LGA2066
Base power
Base power	65 W	165 W
Maximum power
Maximum power	148 W	–
Unlocked
Unlocked	No	Yes
Cooler in the box
Cooler in the box	–	No
Memory support
Memory support	Up to DDR5 4800 MT/s or up to DDR4 3200 MT/s; 2 channels, up to 192 GB	Up to 128 GB; four channels of DDR4-2666; 85 GB/s maximum published bandwidth; no ECC.
PCIe
PCIe	PCIe 5.0 and 4.0; 20 lanes (Up to 1x16+4, 2x8+4); DMI 4.0 x8	44 CPU lanes; PCIe 3.0.
Chipsets
Chipsets	–	Intel X299; LGA2066.
Process
Process	Intel 7	14 nm (CHIP exact-model review); Skylake-X. Current Intel specifications omit lithography.
Cooler
Cooler	max operating temperature 100 °C; thermal specification PCG 2020C	Intel explicitly excludes a fan and heatsink from the boxed product; a separate compatible cooler is required. Published junction limit: 102°C.