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Intel Core i5-10400F vs Intel Core i5-9400F

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

IntelCore i5-10400FIntelCore i5-9400F
Overview
ReleasedMay 2020January 2019
Cores and clocks
Cores66
Threads126
Base clock2.9 GHz2.9 GHz
Boost clock4.3 GHz4.1 GHz
L3 cache12 MB9 MB
CoresHyper-Threading supported; Intel Turbo Boost 2.0 supported, without Turbo Boost Max 3.0 or Thermal Velocity Boost.Six cores without Hyper-Threading; Intel Turbo Boost 2.0 supported. Intel's F suffix denotes a processor requiring separate graphics; its multiplier is locked.
ClocksLocked CPU multiplier (Intel support). ComputerBase reports an Intel-confirmed 134 W PL2 limit for 28 seconds; the current Intel specification page publishes TDP only.Maximum turbo is a single-core frequency; sustained clocks depend on cooling and motherboard power settings. Intel publishes TDP without a separate maximum turbo-power figure.
Graphics and AI
Built-in graphicsNoNo
GraphicsNo integrated graphics; a separate graphics card is required (Intel support).No integrated GPU; a separate graphics card is required, including for motherboard display outputs.
Platform
SocketLGA1200LGA1151
Base power65 W65 W
UnlockedNoNo
Cooler in the box–Yes
Memory supportUp to 128 GB; two channels; DDR4-2666; 41.6 GB/s maximum bandwidth; ECC not supported.Up to 128 GB; two channels; DDR4-2666; 41.6 GB/s maximum bandwidth; ECC not supported.
PCIePCIe 3.0; 16 CPU lanes, configured as 1×16, 2×8 or 1×8+2×4.PCIe 3.0; 16 CPU lanes, configured as 1×16, 2×8 or 1×8+2×4.
Process14 nm; Comet Lake; 37.5 × 37.5 mm package; 100°C maximum junction temperature. ComputerBase identifies G1 six-core-die and Q0 ten-core-die versions with the same published core, cache and clock specifications; its G1 sample uses thermal paste under the heat spreader, while Q0 is soldered.14 nm; Coffee Lake; 37.5 × 37.5 mm package; 100°C maximum junction temperature. ComputerBase identifies a paste thermal interface on its launch sample; this should not be assumed for every later stepping.
Cooler–Boxed cooler included and tested by TechSpot. Intel 300-series motherboard compatibility requires the appropriate BIOS and vendor support. Intel's January release notice gives a late-January through first-quarter rollout for the new models; IT Home reports the exact 9400F on sale in China on 28 January, supporting month precision rather than a confirmed worldwide first-sale day.

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