Xeon E-2456 vs i9-9940X

Primary details

Comparing Core i9-9940X and Xeon E-2456 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	342	458
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	5.55	92.70
Market segment	Desktop processor	Server
Series	Intel Core i9	no data
Power efficiency	10.10	17.69
Architecture codename	Skylake (server) (2017−2019)	Raptor Lake-S (2023−2024)
Release date	19 October 2018 (5 years ago)	14 December 2023 (less than a year ago)
Launch price (MSRP)	$1,387	$375

Cost-effectiveness evaluation

Performance per price, higher is better.

Xeon E-2456 has 1570% better value for money than i9-9940X.

Detailed specifications

Core i9-9940X and Xeon E-2456 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	3.3 GHz
Boost clock speed	4.5 GHz	5.1 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	16 GT/s
Multiplier	33	no data
L1 cache	64 KB (per core)	80 KB (per core)
L2 cache	1 MB (per core)	1.25 MB (per core)
L3 cache	19.25 MB (shared)	18 MB (shared)
Chip lithography	14 nm	Intel 7 nm
Die size	484 mm2	163 mm2
Maximum core temperature	88 °C	100 °C
64 bit support	+	+
Windows 11 compatibility	+	no data
Unlocked multiplier	+	-

Compatibility

Information on Core i9-9940X and Xeon E-2456 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 (Uniprocessor)	1
Socket	FCLGA2066	FCLGA1700
Power consumption (TDP)	165 Watt	80 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-9940X and Xeon E-2456. 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
Hyper-Threading Technology	+	+
TSX	+	-
Idle States	no data	+
Thermal Monitoring	-	+
Turbo Boost Max 3.0	+	-
Status	Discontinued	Launched

Security technologies

Core i9-9940X and Xeon E-2456 technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	+
EDB	+	+
Secure Key	no data	+
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-9940X and Xeon E-2456 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 Xeon E-2456. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR5-4800
Maximum memory size	128 GB	128 GB
Max memory channels	4	2
Maximum memory bandwidth	85.33 GB/s	no data
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

N/A

Peripherals

Specifications and connection of peripherals supported by Core i9-9940X and Xeon E-2456.

PCIe version	3.0	5
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.

Pros & cons summary

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Performance score	18.32	15.55
Recency	19 October 2018	14 December 2023
Physical cores	14	6
Threads	28	12
Power consumption (TDP)	165 Watt	80 Watt

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Should you still have questions on choice between Core i9-9940X and Xeon E-2456, ask them in Comments section, and we shall answer.

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