EPYC 7643P vs Ryzen 9 3900

Primary details

Comparing Ryzen 9 3900 and EPYC 7643P processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	284	48
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	21.62	13.44
Market segment	Desktop processor	Server
Series	AMD Matisse (Ryzen 3000 Desktop)	no data
Architecture codename	Matisse (Zen 2) (2019−2020)	Milan (2021−2023)
Release date	24 September 2019 (5 years ago)	5 September 2023 (1 year ago)
Launch price (MSRP)	$499	$2,722

Cost-effectiveness evaluation

Performance per price, higher is better.

Ryzen 9 3900 has 61% better value for money than EPYC 7643P.

Detailed specifications

Ryzen 9 3900 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	12 (Dodeca-Core)	48 (Octatetraconta-Core)
Threads	24	96
Base clock speed	3.1 GHz	2.3 GHz
Boost clock speed	4.3 GHz	3.6 GHz
L1 cache	768 KB	64 KB (per core)
L2 cache	6 MB	512 KB (per core)
L3 cache	64 MB	256 MB (shared)
Chip lithography	7 nm, 12 nm	7 nm
Die size	2x 74 mm2	8x 81 mm2
Number of transistors	7,600 million	33,200 million
64 bit support	+	-
Windows 11 compatibility	-	no data
Unlocked multiplier	+	-

Compatibility

Information on Ryzen 9 3900 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	1
Socket	AM4	SP3
Power consumption (TDP)	65 Watt	225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 3900 and EPYC 7643P. You'll probably need this information if you require some particular technology.

Instruction set extensions	86x MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A,-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2	no data
AES-NI	+	+
AVX	+	+
Precision Boost 2	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 3900 and EPYC 7643P are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 3900 and EPYC 7643P. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-3200	DDR4
Maximum memory size	128 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	51.196 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

N/A

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 3900 and EPYC 7643P.

PCIe version	4.0	4.0
PCI Express lanes	24	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.

Pros & cons summary

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Performance score	20.17	44.97
Recency	24 September 2019	5 September 2023
Physical cores	12	48
Threads	24	96
Power consumption (TDP)	65 Watt	225 Watt

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Should you still have questions on choice between Ryzen 9 3900 and EPYC 7643P, ask them in Comments section, and we shall answer.

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