Xeon E5-2666 V3 vs EPYC 7551

Primary details

Comparing EPYC 7551 and Xeon E5-2666 V3 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	409	866
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.27	no data
Market segment	Server	Server
Series	AMD EPYC	no data
Power efficiency	8.60	6.26
Architecture codename	Naples (2017−2018)	Haswell-EP (2014−2015)
Release date	29 June 2017 (7 years ago)	13 November 2014 (10 years ago)
Launch price (MSRP)	$3,400	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

EPYC 7551 and Xeon E5-2666 V3 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)	10 (Deca-Core)
Threads	64	20
Base clock speed	2 GHz	2.9 GHz
Boost clock speed	3 GHz	3.5 GHz
Multiplier	20	no data
L1 cache	96K (per core)	64K (per core)
L2 cache	512K (per core)	256K (per core)
L3 cache	64 MB (shared)	25 MB (shared)
Chip lithography	14 nm	22 nm
Die size	192 mm2	356 mm2
Number of transistors	4,800 million	2,600 million
64 bit support	+	+
Windows 11 compatibility	-	no data
Unlocked multiplier	+	-

Compatibility

Information on EPYC 7551 and Xeon E5-2666 V3 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	TR4	2011-3
Power consumption (TDP)	180 Watt	135 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7551 and Xeon E5-2666 V3. You'll probably need this information if you require some particular technology.

AES-NI	+	+
AVX	+	+
vPro	no data	+
Enhanced SpeedStep (EIST)	no data	+
TSX	-	+

Security technologies

EPYC 7551 and Xeon E5-2666 V3 technologies aimed at improving security, for example, by protecting against hacks.

TXT

no data

+

Virtualization technologies

Virtual machine speed-up technologies supported by EPYC 7551 and Xeon E5-2666 V3 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7551 and Xeon E5-2666 V3. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4 Eight-channel	DDR3, DDR4 2133 MHz Quad-channel
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	+	-

Peripherals

Specifications and connection of peripherals supported by EPYC 7551 and Xeon E5-2666 V3.

PCIe version	3.0	3.0
PCI Express lanes	128	40

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	16.34	8.93
Recency	29 June 2017	13 November 2014
Physical cores	32	10
Threads	64	20
Chip lithography	14 nm	22 nm
Power consumption (TDP)	180 Watt	135 Watt

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Should you still have questions on choice between EPYC 7551 and Xeon E5-2666 V3, ask them in Comments section, and we shall answer.

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