EPYC 7643 vs Xeon Silver 4208

Primary details

Comparing Xeon Silver 4208 and EPYC 7643 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	991	39
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	18.49	6.37
Market segment	Server	Server
Series	Intel Xeon Silver	AMD EPYC
Power efficiency	7.88	20.14
Architecture codename	Cascade Lake (2019−2020)	Milan (2021−2023)
Release date	2 April 2019 (5 years ago)	15 March 2021 (3 years ago)
Launch price (MSRP)	$417	$4,995

Cost-effectiveness evaluation

Performance per price, higher is better.

Xeon Silver 4208 has 190% better value for money than EPYC 7643.

Detailed specifications

Xeon Silver 4208 and EPYC 7643 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	8 (Octa-Core)	48 (Octatetraconta-Core)
Threads	16	96
Base clock speed	2.1 GHz	2.3 GHz
Boost clock speed	3.2 GHz	3.6 GHz
Multiplier	21	23
L1 cache	512 KB	64 KB (per core)
L2 cache	8 MB	512 KB (per core)
L3 cache	11 MB	256 MB (shared)
Chip lithography	14 nm	7 nm+
Die size	no data	8x 81 mm2
Maximum core temperature	78 °C	no data
Number of transistors	no data	33,200 million
64 bit support	+	+
Windows 11 compatibility	+	+

Compatibility

Information on Xeon Silver 4208 and EPYC 7643 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)	2
Socket	FCLGA3647	SP3
Power consumption (TDP)	85 Watt	225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon Silver 4208 and EPYC 7643. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512	no data
AES-NI	+	+
AVX	+	+
vPro	+	no data
Enhanced SpeedStep (EIST)	+	no data
Speed Shift	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
TSX	+	-
Turbo Boost Max 3.0	-	no data
Deep Learning Boost	+	-

Security technologies

Xeon Silver 4208 and EPYC 7643 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon Silver 4208 and EPYC 7643 are enumerated here.

AMD-V	-	+
VT-d	+	no data
VT-x	+	no data
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon Silver 4208 and EPYC 7643. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2400	DDR4-3200
Maximum memory size	1 TB	4 TiB
Max memory channels	6	no data
Maximum memory bandwidth	115.212 GB/s	204.795 GB/s
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 Xeon Silver 4208 and EPYC 7643.

PCIe version	3.0	4.0
PCI Express lanes	48	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	7.08	47.88
Recency	2 April 2019	15 March 2021
Physical cores	8	48
Threads	16	96
Chip lithography	14 nm	7 nm
Power consumption (TDP)	85 Watt	225 Watt

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Should you still have questions on choice between Xeon Silver 4208 and EPYC 7643, ask them in Comments section, and we shall answer.

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