3 Different LGA 2011 pin outs: Haswell-EP Pictured Alongside Ivy Bridge-EX, Ivy Bridge-EP and Sandy Bridge-EP

Posted February 19, 2014 by Patrick Kennedy in News
Three Different Intel Xeon LGA 2011 Sockets Compared

The server world is going to get a lot more interesting. Intel yesterday released the Ivy Bridge-EX series which introduced a second, not pin compatible, LGA2011 socket. We received many questions asking exactly which socket the new chips used. Checking out ark.intel.com we see Socket FCLGA2011 listed. That is the same as is listed for the Ivy Bridge-EP chips. A common question was whether the Ivy Bridge-EX is therefore compatible with the Ivy Bridge-EP platform. From what we have heard on the now released platforms they are not compatible. What is more, the next generation Haswell-EP is expected to use yet a third LGA2011 revision.

For those that remember, the original LGA2011 socket is used for Intel Xeon E5-x600 series processors and  high-end Core i7 chips. If two different 2011 pin socket types were not enough, that family will soon grow. Likely later this year we will get Haswell-EP chips with the new LGA2011-3 socket.

Haswell-EP is not “officially” released yet and will not be for many more months. Large customers had Haswell-EP A0 silicon well before Ivy Bridge-EP launched so many thousands of these chips are being used on a daily basis. We managed to get a lineup of the Sandy Bridge-EP and Ivy Bridge-EP which use the original LGA2011 socket. The Ivy Bridge-EX chip using the “new” LGA2011 socket. Finally we were able to get a picture of the upcoming Haswell-EP chips with the much publicized LGA2011-3 socket.

Three Different Intel Xeon LGA 2011 Sockets

Three Different Intel Xeon LGA 2011 Sockets

A few quick details pop out. At first glance just looking at the four edges of the Sandy Bridge-EP and Ivy Bridge-EP chips one can see different contact pad alignment than the more full edges around Ivy Bridge-EX and Haswell-EP. At first glance Ivy Bridge-EX and Haswell-EP look like they have similar contact pad alignment. If you look along the bottom right edge you can see between the corner and the notch there are four contact pads on Ivy Bridge-EX. Looking at Haswell-EP there appear to be six.

Here is a shot of two 15 core Ivy Bridge-EX parts. This is likely not a final retail version so the final retail version may differ. There are no chip markings on this one.

Intel Xeon E7 v2 Ivy Bridge-EX Top and Bottom

Intel Xeon E7 v2 Ivy Bridge-EX Top and Bottom

Looking at the Haswell-EP part that will likely become the Intel Xeon E5-2600 v3 in a few months we can get a better idea about the differences. These Haswell-EP chips appear to be an upcoming 14 core variant. For those keeping track, the current Ivy Bridge-EP has a maximum of 12 cores.

Intel Xeon E5 v3 Haswell-EP Top and Bottom

Intel Xeon E5 v3 Haswell-EP Top and Bottom

The bottom line is that from looking at the physical processors we may have three different and incompatible LGA2011 versions by the end of 2014. This makes perfect sense as the E7 v2 chips are a different market segment and the Haswell-EP chips are going to have new features such as DDR4. Still, adding or subtracting a pin wold make things much easier. Finding spare parts three years down the road that are compatible will not be as easy as just doing a search for “LGA2011 motherboard” or “LGA2011 processor” for example.

Disclaimer: The above photographs were not furnished by Intel. Final shipping parts may differ. With the Haswell-EP chips, this is of course just speculation into what Intel may release in the future. We now have evidence of a high-end server Skip-Tock cadence with the E7 series skipping a Sandy Bridge generation.

About the Author

Patrick Kennedy

Patrick has been running ServeTheHome since 2009 and covers a wide variety of home and small business IT topics. For his day job, Patrick is a management consultant focused in the technology industry and has worked with numerous large hardware and storage vendors in the Silicon Valley. The goal of STH is simply to help users find some information about basic server building blocks. If you have any helpful information please feel free to post on the forums.


    John J

    This little site is amazing. How you scoop info like this is great.

    I can’t believe Intel is doing this. How confusing can it get. I don’t even think this is something AMD coming back into the market would fix.


    Why the hell didn’t they just add 1 pin every time, could even match with the release years or something.

    Its like they are trying to be annoying and confusing on purpose. Seriously, is this some kind of troll on customers or insider joke for them? Freakin’ monopolies.


    What motherboard are the “thousands” of Haswell-EP chips running on if it is a new variant of the 2011 socket? Should we expect new motherboards and new chipset when those chips come out?


      The companies with them right now are the same ones that have their own boards designed and built for their server farms. Not something general buyers have access to at this point.

      Do expect new designs for the Intel Xeon E5 v3 series.


    Not real INTELligent if you ask me. A clean break to a new socket would have been wiser but I guess they wanted to keep the manufacturing lines.


    Nobody is going to count the pins. Why not just call them 2012 and 2014?


    Just followed a link here. Great breaking news on the new sockets. You guys have so much cool content. Made my day finding this gem.

    My only observation is why should Intel care what we think? Not like IBM or Oracle are going to care about user input more than Intel.


    First time commenter here. I love STH.

    It’s a shame we’re not getting socket compatibility. Thanks to socket compatibility I was able to build my own gaming laptop
    Dell Inspiron 9200 17″ stock vs modded
    Totally stable end result.
    cost $1200 stock + $800 in upgrades = $2000 total
    1.6GHZ Pentium-m 533FSB 512KB cache to 2.26GHZ OC 2MB cache 533FSB OC (1.7GHZ 400FSB stock)
    512MB memory, upgraded to 2048MB
    Stock mpci wifi upgraded to atheros Wireless G (better signal processing and sensitivity, higher transmit power)
    Stock wifi antenna replaced with high gain internal antenna
    40GB 5200RPM slow HD upgraded to fast 160GB PMR HD that matched the best 7200rpm drives in the benchmarks
    38 watt hour batter swapped for 80 watt hour
    80 watt power supply swapped for 150
    Dual layer DVD burner
    17″ 1440×900 screen for native resolution gaming
    I dropped some thin copper wire between some holes in the socket for the processor to tell the system that this was a processor with a 533MHZ system bus, thus the processor ran at 2.26GHZ. It needed a little extra voltage so I dropped another little copper wire across some pins that permanently increased the voltage. I then put the heatsink back on with AS-5 (Artic Silver 5) amazing stuff I though it was BS, but yes you could see temps 10C cooler with AS-5 over stock. (AS-5 breakin was a bitch though. I didn’t see the lowest temps until 120 hours in and about a dozen power off cooling cycles) I did the same with the graphics card. Better dissipation = less power, and lower fan speed, meaning less power again.

    I could go all out gaming for 2 hours on battery with the screen at 50% brightnessor 4 hours 30 minutes with the office setting and reduced brightness. I did this in 2005.

    Another mod. I was given a Gigabyte P35-DQ6 motherboard with a 2.4GHZ Core 2 Quad, and because I wanted something faster I got a a Xeon LGA 771 processor to LGA775 shim http://www.delidded.com/lga-771-to-775-adapter/ and swapped it for a $85 3.33GHZ Harpertown Xeon. The LGA 771 Xeons have the save internal CPU ID’s as the LGA 775 Core 2 Quad series and thus will work with the mod in the Gigabyte motherboard.

    That’s why I like socket compatibility and standard parts.

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