EPYC 9254 vs EPYC 7643

Primary details

Comparing EPYC 7643 and EPYC 9254 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	39	53
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	6.32	15.64
Market segment	Server	Server
Series	AMD EPYC	AMD EPYC
Power efficiency	20.14	20.22
Architecture codename	Milan (2021−2023)	Genoa (2022−2023)
Release date	12 January 2021 (3 years ago)	10 November 2022 (2 years ago)
Launch price (MSRP)	$4,995	$2,299

Cost-effectiveness evaluation

Performance per price, higher is better.

EPYC 9254 has 147% better value for money than EPYC 7643.

Detailed specifications

EPYC 7643 and EPYC 9254 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	48 (Octatetraconta-Core)	24 (Tetracosa-Core)
Threads	96	48
Base clock speed	2.3 GHz	2.9 GHz
Boost clock speed	3.6 GHz	2.9 GHz
Multiplier	23	29
L1 cache	3 MB	1536 KB
L2 cache	24 MB	24 MB
L3 cache	256 MB (shared)	128 MB (shared)
Chip lithography	7 nm+	5 nm, 6 nm
Die size	8x 81 mm2	4x 72 mm2
Number of transistors	33,200 million	26,280 million
64 bit support	+	+
Windows 11 compatibility	+	no data

Compatibility

Information on EPYC 7643 and EPYC 9254 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	2
Socket	SP3	SP5
Power consumption (TDP)	225 Watt	200 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7643 and EPYC 9254. You'll probably need this information if you require some particular technology.

AES-NI	+	+
AVX	+	+
Precision Boost 2	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by EPYC 7643 and EPYC 9254 are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7643 and EPYC 9254. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-3200	DDR5-4800
Maximum memory size	4 TiB	6 TiB
Maximum memory bandwidth	204.795 GB/s	460.8 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

no data

Peripherals

Specifications and connection of peripherals supported by EPYC 7643 and EPYC 9254.

PCIe version	4.0	5.0
PCI Express lanes	128	128

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	48.79	43.53
Recency	12 January 2021	10 November 2022
Physical cores	48	24
Threads	96	48
Chip lithography	7 nm	5 nm
Power consumption (TDP)	225 Watt	200 Watt

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Should you still have questions on choice between EPYC 7643 and EPYC 9254, ask them in Comments section, and we shall answer.

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