Core i7-7740X vs Core i9-7940X

Primary details

Comparing Core i9-7940X and Core i7-7740X processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	355	1013
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.20	8.68
Market segment	Desktop processor	Desktop processor
Series	Intel Core i9	Core i7 (Desktop)
Architecture codename	Skylake (server) (2017−2019)	Kaby Lake-X (2017)
Release date	1 September 2017 (6 years ago)	26 June 2017 (7 years ago)
Launch price (MSRP)	$1,399	$339
Current price	$1926 (1.4x MSRP)	$139 (0.4x MSRP)

Cost-effectiveness evaluation

Performance per price, higher is better.

i7-7740X has 171% better value for money than i9-7940X.

Detailed specifications

Core i9-7940X and Core i7-7740X 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)	4 (Quad-Core)
Threads	28	8
Base clock speed	3.1 GHz	4.3 GHz
Boost clock speed	4.4 GHz	4.5 GHz
Bus support	4 × 8 GT/s	no data
L1 cache	64 KB (per core)	64K (per core)
L2 cache	1 MB (per core)	256K (per core)
L3 cache	19.25 MB (shared)	8 MB (shared)
Chip lithography	14 nm	14 nm
Die size	484 mm2	no data
Maximum core temperature	102 °C	100 °C
Maximum case temperature (TCase)	no data	72 °C
64 bit support	+	+
Windows 11 compatibility	+	-
Unlocked multiplier	Yes	Yes

Compatibility

Information on Core i9-7940X and Core i7-7740X 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	FCLGA2066
Power consumption (TDP)	165 Watt	112 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-7940X and Core i7-7740X. 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	+	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
TSX	+	+
Turbo Boost Max 3.0	+	no data
Status	Discontinued	Discontinued

Security technologies

Core i9-7940X and Core i7-7740X technologies aimed at improving security, for example, by protecting against hacks.

EDB

+

no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-7940X and Core i7-7740X are enumerated here.

AMD-V	no data	+
VT-d	+	+
VT-x	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-7940X and Core i7-7740X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4
Maximum memory size	128 GB	64 GB
Max memory channels	4	2
Maximum memory bandwidth	85 GB/s	42 GB/s
ECC memory support	-	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

HD 630

Peripherals

Specifications and connection of peripherals supported by Core i9-7940X and Core i7-7740X.

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 i9-7940X outperforms Core i7-7740X by 170% based on our aggregate benchmark results.

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Pros & cons summary

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Performance score	16.82	6.23
Recency	1 September 2017	26 June 2017
Physical cores	14	4
Threads	28	8
Cost	$1399	$339
Power consumption (TDP)	165 Watt	112 Watt

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Should you still have questions on choice between Core i9-7940X and Core i7-7740X, ask them in Comments section, and we shall answer.

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