EPYC 9645 vs EPYC 7551P

Primary details

Comparing EPYC 7551P and EPYC 9645 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	209	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	4.02	no data
Market segment	Server	Server
Series	AMD EPYC	no data
Power efficiency	12.62	no data
Architecture codename	Naples (2017−2018)	Turin (2024)
Release date	29 June 2017 (7 years ago)	10 October 2024 (less than a year ago)
Launch price (MSRP)	$2,100	$11,048

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

EPYC 7551P and EPYC 9645 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)	96
Threads	64	192
Base clock speed	2 GHz	2.3 GHz
Boost clock speed	3 GHz	3.7 GHz
Multiplier	20	no data
L1 cache	96K (per core)	80 KB (per core)
L2 cache	512K (per core)	1 MB (per core)
L3 cache	64 MB (shared)	256 MB (shared)
Chip lithography	14 nm	3 nm
Die size	192 mm2	no data
Number of transistors	4,800 million	no data
64 bit support	+	+
Windows 11 compatibility	-	no data
Unlocked multiplier	+	-

Compatibility

Information on EPYC 7551P and EPYC 9645 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)	2
Socket	TR4	SP5
Power consumption (TDP)	180 Watt	320 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7551P and EPYC 9645. 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 7551P and EPYC 9645 are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7551P and EPYC 9645. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4 Eight-channel	DDR5
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

N/A

Peripherals

Specifications and connection of peripherals supported by EPYC 7551P and EPYC 9645.

PCIe version	3.0	5.0
PCI Express lanes	128	128

Pros & cons summary

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Recency	29 June 2017	10 October 2024
Physical cores	32	96
Threads	64	192
Chip lithography	14 nm	3 nm
Power consumption (TDP)	180 Watt	320 Watt

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