A9-9400 SoC vs EPYC 7451

Primary details

Comparing EPYC 7451 and A9-9400 SoC processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	404	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.73	no data
Market segment	Server	Desktop processor
Series	AMD EPYC	no data
Power efficiency	8.55	no data
Architecture codename	Naples (2017−2018)	Stoney Ridge (2016−2019)
Release date	20 June 2017 (7 years ago)	31 May 2016 (8 years ago)
Launch price (MSRP)	$2,400	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

EPYC 7451 and A9-9400 SoC 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	24 (Tetracosa-Core)	2 (Dual-core)
Threads	48	2
Base clock speed	2.3 GHz	2.4 GHz
Boost clock speed	2.3 GHz	3.2 GHz
Multiplier	23	no data
L1 cache	2.25 MB	160 KB
L2 cache	12 MB	1 MB (per core)
L3 cache	64 MB (shared)	0 KB
Chip lithography	14 nm	28 nm
Die size	213 mm2	125 mm2
Maximum case temperature (TCase)	no data	74 °C
Number of transistors	19200 Million	1,200 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-

Compatibility

Information on EPYC 7451 and A9-9400 SoC 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	2 (Multiprocessor)	1
Socket	TR4	FT4
Power consumption (TDP)	180 Watt	10 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7451 and A9-9400 SoC. You'll probably need this information if you require some particular technology.

AES-NI	+	+
FMA	-	+
AVX	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by EPYC 7451 and A9-9400 SoC are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7451 and A9-9400 SoC. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4 Eight-channel	DDR4
Maximum memory size	2 TiB	no data
Max memory channels	8	no data
Maximum memory bandwidth	170.671 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

Radeon R5 3CU

Peripherals

Specifications and connection of peripherals supported by EPYC 7451 and A9-9400 SoC.

PCIe version	3.0	3.0
PCI Express lanes	128	8

Pros & cons summary

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Recency	20 June 2017	31 May 2016
Physical cores	24	2
Threads	48	2
Chip lithography	14 nm	28 nm
Power consumption (TDP)	180 Watt	10 Watt

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