i9-9800X vs i9-7940X

Primary details

Comparing Core i9-7940X and Core i9-9800X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	401	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	2.98	no data
Market segment	Desktop processor	Desktop processor
Series	Intel Core i9	no data
Power efficiency	9.37	no data
Architecture codename	Skylake (server) (2017−2019)	Skylake-X (2018)
Release date	30 May 2017 (7 years ago)	October 2018 (6 years ago)
Launch price (MSRP)	$1,399	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i9-7940X and Core i9-9800X 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)	8 (Octa-Core)
Threads	28	16
Base clock speed	3.1 GHz	no data
Boost clock speed	4.4 GHz	3.8 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	no data
L1 cache	896 KB	64K (per core)
L2 cache	14 MB	1 MB (per core)
L3 cache	19.25 MB (shared)	16.5 MB (shared)
Chip lithography	14 nm	14 nm
Die size	484 mm2	no data
Maximum core temperature	102 °C	no data
Maximum case temperature (TCase)	no data	72 °C
64 bit support	+	+
Windows 11 compatibility	+	-
Unlocked multiplier	+	+

Compatibility

Information on Core i9-7940X and Core i9-9800X 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	2066
Power consumption (TDP)	165 Watt	165 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-7940X and Core i9-9800X. 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	no data
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
TSX	+	+
Turbo Boost Max 3.0	+	no data

Security technologies

Core i9-7940X and Core i9-9800X technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	+
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-7940X and Core i9-9800X are enumerated here.

VT-d	+	+
VT-x	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-7940X and Core i9-9800X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4
Maximum memory size	128 GB	no data
Max memory channels	4	no data
Maximum memory bandwidth	85.33 GB/s	no data

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 Core i9-9800X.

PCIe version	3.0	no data
PCI Express lanes	44	no data

Pros & cons summary

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Physical cores	14	8
Threads	28	16

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Should you still have questions on choice between Core i9-7940X and Core i9-9800X, ask them in Comments section, and we shall answer.

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