i7-9800X vs i5-9400F

Primary details

Comparing Core i5-9400F and Core i7-9800X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1109	693
Place by popularity	24	not in top-100
Cost-effectiveness evaluation	9.38	6.46
Market segment	Desktop processor	Desktop processor
Series	Intel Core i5	Intel Core i7
Power efficiency	8.68	6.53
Architecture codename	Coffee Lake-R (2018−2019)	Skylake (server) (2017−2018)
Release date	8 January 2019 (5 years ago)	19 October 2018 (6 years ago)
Launch price (MSRP)	$182	$589

Cost-effectiveness evaluation

Performance per price, higher is better.

i5-9400F has 45% better value for money than i7-9800X.

Detailed specifications

Core i5-9400F and Core i7-9800X 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	6 (Hexa-Core)	8 (Octa-Core)
Threads	6	16
Base clock speed	2.9 GHz	3.8 GHz
Boost clock speed	4.1 GHz	4.5 GHz
Bus type	DMI 3.0	DMI 3.0
Bus rate	4 × 8 GT/s	4 × 8 GT/s
Multiplier	29	38
L1 cache	64K (per core)	64 KB (per core)
L2 cache	256K (per core)	1 MB (per core)
L3 cache	9 MB (shared)	16.5 MB (shared)
Chip lithography	14 nm	14 nm
Die size	149 mm2	no data
Maximum core temperature	100 °C	95 °C
Maximum case temperature (TCase)	72 °C	72 °C
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	-	+

Compatibility

Information on Core i5-9400F and Core i7-9800X 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 (Uniprocessor)
Socket	FCLGA1151	FCLGA2066
Power consumption (TDP)	65 Watt	165 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-9400F and Core i7-9800X. You'll probably need this information if you require some particular technology.

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

Security technologies

Core i5-9400F and Core i7-9800X technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-9400F and Core i7-9800X are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-9400F and Core i7-9800X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4-2666
Maximum memory size	128 GB	128 GB
Max memory channels	2	4
Maximum memory bandwidth	42.671 GB/s	85.33 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

N/A

Peripherals

Specifications and connection of peripherals supported by Core i5-9400F and Core i7-9800X.

PCIe version	3.0	3.0
PCI Express lanes	16	44

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	5.96	11.39
Recency	8 January 2019	19 October 2018
Physical cores	6	8
Threads	6	16
Power consumption (TDP)	65 Watt	165 Watt

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Should you still have questions on choice between Core i5-9400F and Core i7-9800X, ask them in Comments section, and we shall answer.

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