Atom x5-E3940 vs Xeon E5-2666 V3

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Aggregate performance score

Xeon E5-2666 V3
2014
10 cores / 20 threads, 135 Watt
9.32
+628%

Xeon E5-2666 V3 outperforms Atom x5-E3940 by a whopping 628% based on our aggregate benchmark results.

Primary details

Comparing Xeon E5-2666 V3 and Atom x5-E3940 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking8422300
Place by popularitynot in top-100not in top-100
Market segmentServerLaptop
Seriesno data5x Intel Atom
Power efficiency6.3011.67
Architecture codenameHaswell-EP (2014−2015)Apollo Lake (2014−2016)
Release date13 November 2014 (9 years ago)30 August 2014 (10 years ago)

Detailed specifications

Xeon E5-2666 V3 and Atom x5-E3940 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 cores10 (Deca-Core)4 (Quad-Core)
Threads204
Base clock speed2.9 GHz1.6 GHz
Boost clock speed3.5 GHz1.8 GHz
L1 cache64K (per core)56K (per core)
L2 cache256K (per core)2 MB (shared)
L3 cache25 MB (shared)0 KB
Chip lithography22 nm14 nm
Die size356 mm2no data
Maximum case temperature (TCase)no data103 °C
Number of transistors2,600 millionno data
64 bit support++
Windows 11 compatibilityno data-

Compatibility

Information on Xeon E5-2666 V3 and Atom x5-E3940 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 configuration21 (Uniprocessor)
Socket2011-3Intel BGA 1296
Power consumption (TDP)135 Watt10 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5-2666 V3 and Atom x5-E3940. You'll probably need this information if you require some particular technology.

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

Security technologies

Xeon E5-2666 V3 and Atom x5-E3940 technologies aimed at improving security, for example, by protecting against hacks.

TXT++

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5-2666 V3 and Atom x5-E3940 are enumerated here.

VT-d++
VT-x++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5-2666 V3 and Atom x5-E3940. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3, DDR4 2133 MHz Quad-channelDDR3-1866
Maximum memory sizeno data8 GB

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardno dataIntel HD Graphics 500

Peripherals

Specifications and connection of peripherals supported by Xeon E5-2666 V3 and Atom x5-E3940.

PCIe version3.02.0
PCI Express lanes404

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


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.

Xeon E5-2666 V3 9.32
+628%
Atom x5-E3940 1.28

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Xeon E5-2666 V3 14269
+631%
Atom x5-E3940 1953

Gaming performance

Pros & cons summary


Performance score 9.32 1.28
Recency 13 November 2014 30 August 2014
Physical cores 10 4
Threads 20 4
Chip lithography 22 nm 14 nm
Power consumption (TDP) 135 Watt 10 Watt

Xeon E5-2666 V3 has a 628.1% higher aggregate performance score, an age advantage of 2 months, and 150% more physical cores and 400% more threads.

Atom x5-E3940, on the other hand, has a 57.1% more advanced lithography process, and 1250% lower power consumption.

The Xeon E5-2666 V3 is our recommended choice as it beats the Atom x5-E3940 in performance tests.

Be aware that Xeon E5-2666 V3 is a server/workstation processor while Atom x5-E3940 is a notebook one.


Should you still have questions on choice between Xeon E5-2666 V3 and Atom x5-E3940, ask them in Comments section, and we shall answer.

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Intel Xeon E5-2666 V3
Xeon E5-2666 V3
Intel Atom x5-E3940
Atom x5-E3940

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Community ratings

Here you can see how users rate the processors, as well as rate them yourself.


4.4 3078 votes

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Questions & comments

Here you can ask a question about Xeon E5-2666 V3 or Atom x5-E3940, agree or disagree with our judgements, or report an error or mismatch.