i5-8400B vs Ryzen 9 3950X

Primary details

Comparing Ryzen 9 3950X and Core i5-8400B processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	202	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	17.85	no data
Market segment	Desktop processor	Laptop
Series	AMD Ryzen 9	Intel Core i5
Power efficiency	21.99	no data
Architecture codename	Matisse (Zen 2) (2019−2020)	Coffee Lake (2017−2019)
Release date	11 June 2019 (5 years ago)	2 April 2018 (6 years ago)
Launch price (MSRP)	$799	$182

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Ryzen 9 3950X and Core i5-8400B 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	16 (Hexadeca-Core)	6 (Hexa-Core)
Threads	32	6
Base clock speed	3.5 GHz	2.8 GHz
Boost clock speed	4.7 GHz	4 GHz
Bus type	no data	DMI 3.0
Bus rate	no data	4 × 8 GT/s
Multiplier	no data	28
L1 cache	1 MB	384 KB
L2 cache	8 MB	1.5 MB
L3 cache	64 MB	9 MB
Chip lithography	7 nm, 12 nm	14 nm
Die size	2 x 72 mm + 125 mm (IO-Die) mm2	126 mm2
Maximum core temperature	no data	100 °C
Number of transistors	19,200 million	no data
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	+	-

Compatibility

Information on Ryzen 9 3950X and Core i5-8400B 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	AM4	FCBGA1440
Power consumption (TDP)	105 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 3950X and Core i5-8400B. You'll probably need this information if you require some particular technology.

Instruction set extensions	86x MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A,-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	no data	+
Turbo Boost Technology	no data	2.0
Hyper-Threading Technology	no data	-
Idle States	no data	+
Thermal Monitoring	-	+
Precision Boost 2	+	no data

Security technologies

Ryzen 9 3950X and Core i5-8400B technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 3950X and Core i5-8400B are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 3950X and Core i5-8400B. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4 Dual-channel	DDR4-2666
Maximum memory size	128 GB	64 GB
Max memory channels	no data	2
Maximum memory bandwidth	51.196 GB/s	42.671 GB/s
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	-	Intel UHD Graphics 630
Max video memory	-	64 GB
Quick Sync Video	-	+
Clear Video	-	+
Clear Video HD	-	+
Graphics max frequency	-	1.05 GHz
InTru 3D	-	+

Graphics interfaces

Available interfaces and connections of Ryzen 9 3950X and Core i5-8400B integrated GPUs.

Number of displays supported

-

3

Graphics image quality

Maximum display resolutions supported by Ryzen 9 3950X and Core i5-8400B integrated GPUs, including resolutions over different interfaces.

4K resolution support	-	+
Max resolution over HDMI 1.4	-	4096x2304@30Hz
Max resolution over eDP	-	4096x2304@60Hz
Max resolution over DisplayPort	-	4096x2304@60Hz

Graphics API support

APIs supported by Ryzen 9 3950X and Core i5-8400B integrated GPUs, sometimes API versions are included.

DirectX	-	12
OpenGL	-	4.5

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 3950X and Core i5-8400B.

PCIe version	no data	3.0
PCI Express lanes	no data	16

Pros & cons summary

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Recency	11 June 2019	2 April 2018
Physical cores	16	6
Threads	32	6
Chip lithography	7 nm	14 nm
Power consumption (TDP)	105 Watt	65 Watt

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Should you still have questions on choice between Ryzen 9 3950X and Core i5-8400B, ask them in Comments section, and we shall answer.

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