AMD EPYC 7251 vs Intel Xeon E5-2643

Comparative analysis of AMD EPYC 7251 and Intel Xeon E5-2643 processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Peripherals, Virtualization, Security & Reliability, Advanced Technologies. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark, Geekbench 4 - Single Core, Geekbench 4 - Multi-Core.

AMD EPYC 7251

Intel Xeon E5-2643

Differences

Reasons to consider the AMD EPYC 7251

CPU is newer: launch date 5 year(s) 3 month(s) later
Processor is unlocked, an unlocked multiplier allows for easier overclocking
4 more cores, run more applications at once: 8 vs 4
8 more threads: 16 vs 8
A newer manufacturing process allows for a more powerful, yet cooler running processor: 14 nm vs 32 nm
3x more L1 cache, more data can be stored in the L1 cache for quick access later
4x more L2 cache, more data can be stored in the L2 cache for quick access later
3.2x more L3 cache, more data can be stored in the L3 cache for quick access later
Around 8% lower typical power consumption: 120 Watt vs 130 Watt
Around 5% better performance in PassMark - Single thread mark: 1671 vs 1598
Around 53% better performance in PassMark - CPU mark: 14935 vs 9748

Specifications (specs)
Launch date	June 2017 vs March 2012
Unlocked	Unlocked vs Locked
Number of cores	8 vs 4
Number of threads	16 vs 8
Manufacturing process technology	14 nm vs 32 nm
L1 cache	96 KB (per core) vs 64 KB (per core)
L2 cache	512 KB (per core) vs 256 KB (per core)
L3 cache	32 MB vs 10240 KB (shared)
Thermal Design Power (TDP)	120 Watt vs 130 Watt
Benchmarks
PassMark - Single thread mark	1671 vs 1598
PassMark - CPU mark	14935 vs 9748

Reasons to consider the Intel Xeon E5-2643

Around 21% higher clock speed: 3.50 GHz vs 2.9 GHz

Maximum frequency	3.50 GHz vs 2.9 GHz

Compare benchmarks

CPU 1: AMD EPYC 7251
CPU 2: Intel Xeon E5-2643

PassMark - Single thread mark

CPU 1

CPU 2

1671

1598

PassMark - CPU mark

CPU 1

CPU 2

14935

9748

Name	AMD EPYC 7251	Intel Xeon E5-2643
PassMark - Single thread mark	1671	1598
PassMark - CPU mark	14935	9748
Geekbench 4 - Single Core		638
Geekbench 4 - Multi-Core		2761

Compare specifications (specs)

	AMD EPYC 7251	Intel Xeon E5-2643
Essentials
Architecture codename	Zen	Sandy Bridge EP
Family	AMD EPYC
Launch date	June 2017	March 2012
Place in performance rating	1179	1784
Series	AMD EPYC 7000 Series	Intel® Xeon® Processor E5 Family
Vertical segment	Server	Server
Launch price (MSRP)		$218
Price now		$2,664
Processor Number		E5-2643
Status		Discontinued
Value for money (0-100)		0.93
Performance
64 bit support
Base frequency	2.1 GHz	3.30 GHz
Die size	192 mm	294 mm
L1 cache	96 KB (per core)	64 KB (per core)
L2 cache	512 KB (per core)	256 KB (per core)
L3 cache	32 MB	10240 KB (shared)
Manufacturing process technology	14 nm	32 nm
Maximum frequency	2.9 GHz	3.50 GHz
Number of cores	8	4
Number of threads	16	8
Transistor count	4800 million	1270 million
Unlocked
Bus Speed		8 GT/s QPI
Maximum core temperature		73°C
Number of QPI Links		2
VID voltage range		0.60V-1.35V
Memory
Max memory channels	8	4
Maximum memory bandwidth	307 GB/s	51.2 GB/s
Supported memory frequency	2400 MHz
Supported memory types	DDR4	DDR3 800/1066/1333/1600
ECC memory support
Maximum memory size		384 GB
Compatibility
Max number of CPUs in a configuration	2	2
Socket Count	1P/2P
Sockets supported	TR4	FCLGA2011
Thermal Design Power (TDP)	120 Watt	130 Watt
Low Halogen Options Available
Package Size		52.5mm x 45.0mm
Peripherals
PCI Express revision	x128	3.0
Max number of PCIe lanes		40
Scalability		2S Only
Virtualization
AMD Virtualization (AMD-V™)
Intel® Virtualization Technology (VT-x)
Intel® Virtualization Technology for Directed I/O (VT-d)
Intel® VT-x with Extended Page Tables (EPT)
Security & Reliability
Execute Disable Bit (EDB)
Intel® Identity Protection technology
Intel® Trusted Execution technology (TXT)
Advanced Technologies
Enhanced Intel SpeedStep® technology
Idle States
Instruction set extensions		Intel® AVX
Intel 64
Intel® Advanced Vector Extensions (AVX)
Intel® AES New Instructions
Intel® Demand Based Switching
Intel® Flex Memory Access
Intel® Hyper-Threading technology
Intel® Turbo Boost technology
Intel® vPro™ Platform Eligibility
Thermal Monitoring