Ryzen 5 8400F vs i3-8121U

Primary details

Comparing Core i3-8121U and Ryzen 5 8400F processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1686	459
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	60.25
Market segment	Laptop	Desktop processor
Series	Intel Core i3	no data
Power efficiency	9.33	22.03
Architecture codename	Coffee Lake-U (2018−2019)	Phoenix (2023−2024)
Release date	5 May 2018 (6 years ago)	1 April 2024 (less than a year ago)
Launch price (MSRP)	no data	$170

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i3-8121U and Ryzen 5 8400F 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	2 (Dual-core)	6 (Hexa-Core)
Threads	4	12
Base clock speed	2.2 GHz	4.2 GHz
Boost clock speed	3.2 GHz	4.7 GHz
Bus type	OPI	no data
Bus rate	4 GT/s	no data
Multiplier	22	no data
L1 cache	64K (per core)	64 KB (per core)
L2 cache	256K (per core)	1 MB (per core)
L3 cache	4 MB (shared)	16 MB (shared)
Chip lithography	10 nm	4 nm
Die size	123 mm2	178 mm2
Maximum core temperature	105 °C	no data
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	no data	25,000 million
64 bit support	+	+
Windows 11 compatibility	-	no data
Unlocked multiplier	-	+

Compatibility

Information on Core i3-8121U and Ryzen 5 8400F 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	Intel BGA1440	AM5
Power consumption (TDP)	15 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i3-8121U and Ryzen 5 8400F. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512	no data
AES-NI	+	+
AVX	+	+
vPro	-	no data
Enhanced SpeedStep (EIST)	+	no data
QuickAssist	-	no data
Speed Shift	+	no data
My WiFi	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
Idle States	+	no data
Thermal Monitoring	+	-
Flex Memory Access	+	no data
Smart Response	+	no data
Demand Based Switching	-	no data
HD Audio	+	no data
RST	+	no data
Precision Boost 2	no data	+

Security technologies

Core i3-8121U and Ryzen 5 8400F technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i3-8121U and Ryzen 5 8400F are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i3-8121U and Ryzen 5 8400F. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR5
Maximum memory size	32 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	38.397 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

Iris Pro Plus

N/A

Peripherals

Specifications and connection of peripherals supported by Core i3-8121U and Ryzen 5 8400F.

PCIe version	3.0	4.0
PCI Express lanes	16	20

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	2.76	15.13
Recency	5 May 2018	1 April 2024
Physical cores	2	6
Threads	4	12
Chip lithography	10 nm	4 nm
Power consumption (TDP)	15 Watt	65 Watt

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Should you still have questions on choice between Core i3-8121U and Ryzen 5 8400F, ask them in Comments section, and we shall answer.

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