Core i5-10400F vs Core i9-9940X

Primary details

Comparing Core i9-9940X and Core i5-10400F processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	311	849
Place by popularity	not in top-100	12
Cost-effectiveness evaluation	11.17	42.31
Market segment	Desktop processor	Desktop processor
Series	Intel Core i9	no data
Architecture codename	Skylake (server) (2017−2019)	Comet Lake (2020)
Release date	8 October 2018 (5 years ago)	30 April 2020 (4 years ago)
Launch price (MSRP)	$1,387	$155
Current price	$833 (0.6x MSRP)	$109 (0.7x MSRP)

Cost-effectiveness evaluation

Performance per price, higher is better.

i5-10400F has 279% better value for money than i9-9940X.

Detailed specifications

Core i9-9940X and Core i5-10400F basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	14 (Tetradeca-Core)	6 (Hexa-Core)
Threads	28	12
Base clock speed	3.3 GHz	2.9 GHz
Boost clock speed	4.5 GHz	4.3 GHz
Bus support	4 × 8 GT/s	no data
L1 cache	896 KB	64K (per core)
L2 cache	14 MB	256K (per core)
L3 cache	19.25 MB (shared)	12 MB (shared)
Chip lithography	14 nm	14 nm
Die size	484 mm2	no data
Maximum core temperature	88 °C	100 °C
Maximum case temperature (TCase)	no data	72 °C
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	Yes	No

Compatibility

Information on Core i9-9940X and Core i5-10400F compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	1	1
Socket	FCLGA2066	FCLGA1200
Power consumption (TDP)	165 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-9940X and Core i5-10400F. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
TSX	+	-
Idle States	no data	+
Thermal Monitoring	no data	+
SIPP	no data	-
Turbo Boost Max 3.0	+	-
Status	Discontinued	Launched

Security technologies

Core i9-9940X and Core i5-10400F technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	+
EDB	+	+
Secure Key	no data	+
Identity Protection	no data	+
SGX	no data	Yes with Intel® ME
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-9940X and Core i5-10400F are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	no data	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-9940X and Core i5-10400F. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4
Maximum memory size	128 GB	128 GB
Max memory channels	4	2
Maximum memory bandwidth	85 GB/s	41.6 GB/s
ECC memory support	-	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

no data

Peripherals

Specifications and connection of peripherals supported by Core i9-9940X and Core i5-10400F.

PCIe version	3.0	3.0
PCI Express lanes	44	16

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

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Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Core i9-9940X outperforms Core i5-10400F by 115% based on our aggregate benchmark results.

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Pros & cons summary

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Performance score	18.12	8.42
Recency	8 October 2018	30 April 2020
Physical cores	14	6
Threads	28	12
Cost	$1387	$155
Power consumption (TDP)	165 Watt	65 Watt

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Should you still have questions on choice between Core i9-9940X and Core i5-10400F, ask them in Comments section, and we shall answer.

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