Xeon E5-2666 V3 vs Ryzen Threadripper PRO 3945WX

Primary details

Comparing Ryzen Threadripper PRO 3945WX and Xeon E5-2666 V3 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	226	778
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	8.51	no data
Market segment	Server	Server
Series	AMD Ryzen Threadripper	no data
Architecture codename	Matisse (2019−2020)	Haswell-EP (2014)
Release date	14 July 2020 (3 years ago)	13 November 2014 (9 years ago)
Current price	$1961	$59

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Ryzen Threadripper PRO 3945WX 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	12 (Dodeca-Core)	10 (Deca-Core)
Threads	24	20
Base clock speed	4 GHz	2.9 GHz
Boost clock speed	4.3 GHz	3.5 GHz
L1 cache	64K (per core)	64K (per core)
L2 cache	512K (per core)	256K (per core)
L3 cache	64 MB	25 MB (shared)
Chip lithography	7 nm, 12 nm	22 nm
Die size	74 mm2	356 mm2
Maximum case temperature (TCase)	95 °C	no data
Number of transistors	3,800 million	2,600 million
64 bit support	+	+
Windows 11 compatibility	+	no data
Unlocked multiplier	Yes	No

Compatibility

Information on Ryzen Threadripper PRO 3945WX 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	1	2
Socket	TR4	2011-3
Power consumption (TDP)	280 Watt	135 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen Threadripper PRO 3945WX 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	no data	+

Security technologies

Ryzen Threadripper PRO 3945WX 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 Ryzen Threadripper PRO 3945WX and Xeon E5-2666 V3 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen Threadripper PRO 3945WX and Xeon E5-2666 V3. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-3200	DDR3, DDR42133 MHz Quad-channel
Maximum memory size	2 TiB	no data
Maximum memory bandwidth	204.8 GB/s	no data

Peripherals

Specifications and connection of peripherals supported by Ryzen Threadripper PRO 3945WX and Xeon E5-2666 V3.

PCIe version	4.0	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.

Ryzen Threadripper PRO 3945WX outperforms Xeon E5-2666 V3 by 134% based on our aggregate benchmark results.

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Pros & cons summary

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Performance score	21.66	9.26
Recency	14 July 2020	13 November 2014
Physical cores	12	10
Threads	24	20
Chip lithography	7 nm	22 nm
Power consumption (TDP)	280 Watt	135 Watt

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Should you still have questions on choice between Ryzen Threadripper PRO 3945WX and Xeon E5-2666 V3, ask them in Comments section, and we shall answer.

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