AMD EPYC 7643 vs AMD EPYC 7742

Comparative analysis of AMD EPYC 7643 and AMD EPYC 7742 processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Peripherals, Advanced Technologies, Virtualization. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark.

AMD EPYC 7643

AMD EPYC 7742

Differences

Reasons to consider the AMD EPYC 7643

CPU is newer: launch date 1 year(s) 7 month(s) later
Around 6% higher clock speed: 3.6 GHz vs 3.4 GHz

Launch date	15 Mar 2021 vs 7 Aug 2019
Maximum frequency	3.6 GHz vs 3.4 GHz

Reasons to consider the AMD EPYC 7742

16 more cores, run more applications at once: 64 vs 48
32 more threads: 128 vs 96
Around 33% more L1 cache; more data can be stored in the L1 cache for quick access later
Around 33% more L2 cache; more data can be stored in the L2 cache for quick access later
Around 7% lower typical power consumption: 225 Watt vs 240 Watt
Around 1% better performance in PassMark - Single thread mark: 2046 vs 2020
Around 3% better performance in PassMark - CPU mark: 94081 vs 91554

Specifications (specs)
Number of cores	64 vs 48
Number of threads	128 vs 96
L1 cache	4 MB vs 3 MB
L2 cache	32 MB vs 24 MB
Thermal Design Power (TDP)	225 Watt vs 240 Watt
Benchmarks
PassMark - Single thread mark	2046 vs 2020
PassMark - CPU mark	94081 vs 91554

Compare benchmarks

CPU 1: AMD EPYC 7643
CPU 2: AMD EPYC 7742

PassMark - Single thread mark

CPU 1

CPU 2

2020

2046

PassMark - CPU mark

CPU 1

CPU 2

91554

94081

Name	AMD EPYC 7643	AMD EPYC 7742
PassMark - Single thread mark	2020	2046
PassMark - CPU mark	91554	94081

Compare specifications (specs)

	AMD EPYC 7643	AMD EPYC 7742
Essentials
Architecture codename	Zen 3	Zen 2
Launch date	15 Mar 2021	7 Aug 2019
Launch price (MSRP)	$4995
OPN PIB	100-100000326WOF
OPN Tray	100-000000326
Place in performance rating	176	157
Vertical segment	Server	Server
Performance
Base frequency	2.3 GHz	2.25 GHz
L1 cache	3 MB	4 MB
L2 cache	24 MB	32 MB
L3 cache	256 MB	256 MB
Manufacturing process technology	7 nm+	7 nm, 14 nm
Maximum frequency	3.6 GHz	3.4 GHz
Number of cores	48	64
Number of threads	96	128
Unlocked
Memory
ECC memory support
Max memory channels	8	8
Maximum memory bandwidth	190.73 GB/s	190.7 GB/s
Maximum memory size	4 TB	4 TB
Supported memory types	DDR4-3200	DDR4-3200
Compatibility
Configurable TDP	225-240 Watt
Socket Count	1P/2P
Sockets supported	SP3	SP3
Thermal Design Power (TDP)	240 Watt	225 Watt
Max number of CPUs in a configuration		2
Peripherals
Max number of PCIe lanes	128	128
PCI Express revision	4.0	4.0
PCIe configurations		x16, x8
Advanced Technologies
AMD SenseMI
Fused Multiply-Add 3 (FMA3)
Intel® Advanced Vector Extensions (AVX)
Intel® Advanced Vector Extensions 2 (AVX2)
Intel® AES New Instructions
Virtualization
AMD Virtualization (AMD-V™)