Intel Xeon E5-2666 v3 specifications
| General information | |
| Type | CPU / Microprocessor |
| Market segment | Server |
| Family | Intel Xeon E5-2600 v3 |
| Model number ? | E5-2666 v3 |
| CPU part number |
|
| Frequency ? | 2.9 GHz / 2900 MHz |
| Maximum turbo frequency | |
| Bus speed ? | |
| Clock multiplier ? | |
| Package | |
| Socket | Socket 2011-3 / R3 / LGA2011-3 |
| Size | |
| Introduction date | |
| S-spec numbers | |
| Architecture / Microarchitecture | |
| Instruction set | |
| Microarchitecture | |
| Platform | |
| Processor core ? | |
| Manufacturing process | |
| Data width | 64 bit |
| The number of CPU cores | 10 |
| The number of threads | |
| Floating Point Unit | Integrated |
| Level 1 cache size ? | |
| Level 2 cache size ? | |
| Level 3 cache size | 25 MB |
| Multiprocessing | |
| Extensions & Technologies | |
| Security Features | |
| Low power features | |
| Integrated Graphics Processing Unit | |
| None | |
| Integrated peripherals / components | |
| Memory controller | |
| Other peripherals | |
| Electrical / Thermal parameters | |
| Thermal Design Power ? | |
| Notes on Intel Xeon E5-2666 v3 | |
Detailed side-by-side comparison
FAQ
Q: Can I upgrade my Xeon E5-2666 v3 microprocessor?
A: Probably yes. Processor compatibility is determined by your motherboard. Please check CPU-Upgrade.com website for CPU support list for your board.
Xeon E5-2666 v3 Overclocking
Sorry, overclocking information for the microprocessor is not available at this time.
Related news stories
Custom Xeon E5-2600 v3 CPUs for AWS platform
Jul 01, 2015: Last week we reported on a new custom Xeon E7-8895 v3microprocessor, introduced in June in Oracle Server X5 computers. Model and S-Spec numbers of this Xeon E7 CPU were spottedin a recently released Product Change Notification, that listed several SKUs, designed for large OEM manufacturers. The document alsocontained several unknown Xeon CPUs from E5-2600 v3 series, such asE5-2666 v3 and E5-2676 v3. One of these models was launched lastmonth.
CPU ID information for the Xeon E5-2666 v3
Detailed characteristics of processor's internals, including x86instruction set extensions and individual instructions, high- and low-leveltechnologies, are listed below. This list was acquired from an actualIntel Xeon E5-2666 v3 processor with the help of the x86 CPUID instruction. Anydiscrepancies between CPUID features and official specifications arelikely due to some features being disabled in BIOS, or due to a bug inour CPUID decoding algorithm.Different steppings of Intel processors may also have slightly different features.
Search or browse all public submissions in our CPUID database.
Use our CPU identification tool to check features of your processor.
| Submission details | |||
|---|---|---|---|
| Manufacturer: | Intel | Measured frequency: | 2900 MHz |
| CPU Family: | Xeon | Comment: | |
| Processor Number: | E5-2666 v3 | ||
| Part number (supplied): | Submitted by: | ||
| Part number (guessed): | CM8064401675902 | Submitted on: | |
| S-Spec Number: | CWID version: | 0.5 | |
General information
Cache details
Supported instructions
Integrated features and technologies
CPUs, related to Intel Xeon E5-2666 v3
The list of related CPUs does not include all models. For the complete list, please see the related "Haswell" processors for socket 2011-3 page.
| Model | Cores / Threads | Frequency | Turbo frequency | L3 cache | Multi- processing | TDP | Features | |
|---|---|---|---|---|---|---|---|---|
| Intel Xeon E5-2600 v3 family, Socket 2011-3 | ||||||||
| Xeon E5-2666 v3 | 10 / 20 | 2.9 GHz | 25 MB | |||||
| Xeon E5-2670 v3 | 12 / 24 | 2.3 GHz | 30 MB | > | ||||
| Xeon E5-2675 v3 | 16 / 32 | 1.8 GHz | 40 MB | > | ||||
| Xeon E5-2687W v3 | 10 / 20 | 3.1 GHz | 25 MB | > | ||||
| Xeon E5-2673 v3 | 12 / 24 | 2.4 GHz | 30 MB | > | ||||
| Xeon E5-2680 v3 | 12 / 24 | 2.5 GHz | 30 MB | > | ||||
| Xeon E5-2683 v3 | 14 / 28 | 2 GHz | 35 MB | > | ||||
| Xeon E5-2690 v3 | 12 / 24 | 2.6 GHz | 30 MB | > | ||||
| Xeon E5-2695 v3 | 14 / 28 | 2.3 GHz | 35 MB | > | ||||
| Xeon E5-2696 v3 | 18 / 36 | 2.3 GHz | 45 MB | > | ||||
| Xeon E5-2697 v3 | 14 / 28 | 2.6 GHz | 35 MB | > | ||||
| Xeon E5-2698 v3 | 16 / 32 | 2.3 GHz | 40 MB | > | ||||
| Xeon E5-2698A v3 | 16 / 32 | 2.8 GHz | 40 MB | > | ||||
| Xeon E5-2686 v3 | 18 / 36 | 2 GHz | 45 MB | > | ||||
| Xeon E5-2699 v3 | 18 / 36 | 2.3 GHz | 45 MB | > | ||||
| Other families, Haswell micro-architecture, Socket 2011-3 | ||||||||
| Xeon E5-4640 v3 | 12 / 24 | 1.9 GHz | 30 MB | > | ||||
| Xeon E5-1680 v3 | 8 / 16 | 3.2 GHz | 20 MB | > | ||||
| Xeon E5-4650 v3 | 12 / 24 | 2.1 GHz | 30 MB | > | ||||
| Xeon E5-1681 v3 | 10 / 20 | 2.9 GHz | 25 MB | > | ||||
| Xeon E5-4660 v3 | 14 / 28 | 2.1 GHz | 35 MB | > | ||||
| Xeon E5-1686 v3 | 12 / 24 | 2.6 GHz | 30 MB | > | ||||
| Xeon E5-4667 v3 | 16 / 32 | 2 GHz | 40 MB | > | ||||
| Xeon E5-1691 v3 | 14 / 28 | 2.5 GHz | 35 MB | > | ||||
| Xeon E5-4669 v3 | 18 / 36 | 2.1 GHz | 45 MB | > | ||||
• Within each category, the CPUs are sorted from slower (at the top) to faster (at the bottom)
• Background color of specs and features indicate whether they are better or worse than similar spec/feature of the Xeon E5-2666 v3
• Click on the > icon to compare any CPU in the table with the Intel Xeon E5-2666 v3 (Javascript required).
• Features abbreviations:
TXT - Trusted Execution technology
Pictures (1)
| SR1Y7 | |
2022-03-12 19:05:03 Posted by: Pablo Casado | |
Intel Xeon E5 2666 V3 Processor SR1Y7 2.9Ghz 10 Core 135W Socket LGA 2011-3 |  |
Comments (3)
You're welcome to post suggestions, corrections, your own personalIntel Xeon E5-2666 v3 review, or your experience with the microprocessor.Please do not ask upgrade and troubleshooting questions, and do not startdiscussions.
Amazon custom cpu
2016-06-16 15:11:47
Posted by: Rollo
this one has NO hyperthreading, 10 cores / 10 threads
E5-2666v3 and hyperthreading
2020-05-18 04:06:30
Posted by: Justine Yun
I'm running two E5-2666's in a dual socket system atm. I have 10 cores and 20 threads in each of mine.
Also it's perfectly stable, no features missing like there are in a lot of ES/QS cpu's if anyone is concerned about this processor being kinda denied of existing to some degree by Intel or that they were built specifically for Amazon for specific machines and a very specific use-case.
There is unfortunately nothing incredible (like an unlocked multiplier, which would make it basically an e5-1681v3) about it. At least an Asrock Rack, Asus Z10PR, or HP z440 wouldn't offer it in the bios settings despite the first two offering overclocking on the 16xx v3 series. XTU states that it isn't unlocked, but XTU also says that there are only 8 cores despite dmidecode, CPU-Z, BIOS, and system information metrics all reporting 10.
Another oddity though is that though there are 10 cores, there are 12 core temperature sensors instead of 10 which seems to indicate that there either are or were 12 cores at some point in the lives of these processors. Maybe Amazon wanted 12 cores with a high-ish clock or something but either Intel found it to be unstable or Amazon found the power requirements to be unacceptable. It would explain why XTU thinks that there are two fewer cores; they could have just accidentally removed two cores in their internal documentation twice. Maybe the two extra cores are intact and someone with more understanding than me could find a way to reactivate them.
I hope that this information is helpful to anyone reading this, I just wish that my understanding of BIOS modification, microcodes, efi, and the like were better so I could solve the case of one of Intel's 'secret' cpu's.
Hyperthreading
2017-11-28 22:17:02
Posted by: Rudiger Smoot
QFSC 10-core being labeled as "E5-2666 v3" does not have HT.
The production proc has HT enabled.
Last modified: 12 Jul 2024
