Xeon W-2155 vs i9-7940X

Primary details

Comparing Core i9-7940X and Xeon W-2155 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	400	558
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.36	7.47
Market segment	Desktop processor	Server
Series	Intel Core i9	Intel Xeon W
Power efficiency	9.37	8.98
Architecture codename	Skylake (server) (2017−2018)	Skylake (server) (2017−2018)
Release date	1 September 2017 (7 years ago)	29 August 2017 (7 years ago)
Launch price (MSRP)	$1,399	$1,440

Cost-effectiveness evaluation

Performance per price, higher is better.

Xeon W-2155 has 122% better value for money than i9-7940X.

Detailed specifications

Core i9-7940X and Xeon W-2155 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)	10 (Deca-Core)
Threads	28	20
Base clock speed	3.1 GHz	3.3 GHz
Boost clock speed	4.4 GHz	4.5 GHz
Bus type	DMI 3.0	DMI 3.0
Bus rate	4 × 8 GT/s	4 × 8 GT/s
Multiplier	no data	33
L1 cache	64 KB (per core)	64K (per core)
L2 cache	1 MB (per core)	1 MB (per core)
L3 cache	19.25 MB (shared)	13.75 MB (shared)
Chip lithography	14 nm	14 nm
Die size	484 mm2	484 mm2
Maximum core temperature	102 °C	no data
Maximum case temperature (TCase)	no data	68 °C
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	+	-

Compatibility

Information on Core i9-7940X and Xeon W-2155 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 (Uniprocessor)
Socket	FCLGA2066	FCLGA2066
Power consumption (TDP)	165 Watt	140 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-7940X and Xeon W-2155. 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® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512
AES-NI	+	+
AVX	+	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
TSX	+	+
Idle States	no data	+
Thermal Monitoring	-	+
Flex Memory Access	no data	-
Demand Based Switching	no data	+
PAE	no data	46 Bit
Turbo Boost Max 3.0	+	-

Security technologies

Core i9-7940X and Xeon W-2155 technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	+
EDB	+	+
Secure Key	no data	+
MPX	-	+
Identity Protection	-	+
SGX	no data	-
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-7940X and Xeon W-2155 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-7940X and Xeon W-2155. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4-1600, DDR4-1866, DDR4-2133, DDR4-2400, DDR4-2666
Maximum memory size	128 GB	512 GB
Max memory channels	4	4
Maximum memory bandwidth	85.33 GB/s	85.33 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 i9-7940X and Xeon W-2155.

PCIe version	3.0	3.0
PCI Express lanes	44	48

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.

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Pros & cons summary

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Performance score	16.34	13.28
Physical cores	14	10
Threads	28	20
Power consumption (TDP)	165 Watt	140 Watt

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Should you still have questions on choice between Core i9-7940X and Xeon W-2155, ask them in Comments section, and we shall answer.

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