EPYC 7643P vs EPYC 7551P

Primary details

Comparing EPYC 7551P and EPYC 7643P processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	181	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	21.39	no data
Market segment	Server	Server
Series	AMD EPYC	no data
Architecture codename	Naples (2017−2018)	Milan (2021)
Release date	29 June 2017 (7 years ago)	no data
Launch price (MSRP)	$2,100	no data
Current price	$529 (0.3x MSRP)	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

EPYC 7551P and EPYC 7643P 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	32 (Dotriaconta-Core)	48 (Octatetraconta-Core)
Threads	64	96
Base clock speed	2 GHz	2.3 GHz
Boost clock speed	3 GHz	3.6 GHz
L1 cache	96K (per core)	64 KB (per core)
L2 cache	512K (per core)	512 KB (per core)
L3 cache	64 MB (shared)	256 MB (shared)
Chip lithography	14 nm	7 nm
Die size	192 mm2	8x 81 mm2
Number of transistors	4,800 million	33,200 million
64 bit support	+	-
Windows 11 compatibility	-	no data
Unlocked multiplier	Yes	No

Compatibility

Information on EPYC 7551P and EPYC 7643P 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	TR4	SP3
Power consumption (TDP)	180 Watt	225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7551P and EPYC 7643P. You'll probably need this information if you require some particular technology.

AES-NI	+	+
AVX	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by EPYC 7551P and EPYC 7643P are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7551P and EPYC 7643P. 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	+	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

N/A

Peripherals

Specifications and connection of peripherals supported by EPYC 7551P and EPYC 7643P.

PCIe version	3.0	4.0
PCI Express lanes	128	no data

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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Pros & cons summary

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Physical cores	32	48
Threads	64	96
Chip lithography	14 nm	7 nm
Power consumption (TDP)	180 Watt	225 Watt

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Should you still have questions on choice between EPYC 7551P and EPYC 7643P, ask them in Comments section, and we shall answer.

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