motherboard - Will socket 1155 cpu work in 775 mobo

  • Arremer

    will INTEL Celeron G440 BOX (s. 1155) work in ASROCK G31M-S R2.0 (s. 775) motherboard?

    I belive I heard that AM3 cpu can work in AM2 mobo is it the same case with intel.

  • Answers
  • Synetech

    No, they are not compatible by any stretch of the imagination.

    The AM2 socket has 940 contacts while the AM3 socket has 941, but otherwise, the arrangement of contacts is the same. AM3 CPUs have only 938 contacts and can be used in AM2 and AM2+ sockets (assuming a BIOS update) because they were made to be backward-compatible. AM2 CPUs do not work in an AM3 system because they do not have the newer controllers.

    Intel on the other hand changes greatly with newer version. The socket 775 has 775 contacts while the socket 1155 has 1155 contacts. As you can see below, they are completely physically incompatible. In fact, even socket 1156 is incompatible with the (newer) socket 1155.

    Socket AM2:

    enter image description here

    Socket AM3:

    enter image description here

    Socket 775:

    enter image description here

    Socket 1155:

    enter image description here

    Socket 1156:
    enter image description here

  • Journeyman Geek

    No, they are entirely incompatable pin outs - intel doesn't have backward compatibility between socket types - the 1155 has , well 1155 contacts and the 775 has 775 contacts, even if they have the same processor dimensions. It simply will not work.

  • Lamar B

    NO they will not. AMD has released some chips that used the same physical socket with different specs that were sometimes compatible depending on chipset, cpu, and bios support.

  • Dennis

    No. There are several reasons for that. Here are two:

    1. LGA 775 CPUs have 775 pins while LGA 1155 CPUs have 1155 pins.

    2. LGA 1155 CPUs access the memory directly while LGA 775 CPUs let the northbridge handle the RAM.

  • Paul

    No. The physical socket is dramatically different. See here and here. So is all the underlying componentry to support the CPU.

  • Related Question

    motherboard - Is it possible to use an Intel Q8400 CPU in my ASUS P5N-EM HDMI mobo?
  • Pure.Krome

    I have an ASUS P5N-EM HDMI motherboard. Currently, it's using an oldish P4 cpu. Works fine.

    I just received a spankin' new Core2 Quad Processor Q8400 a few mins ago. Unopened, in the box.

    I have no idea if this cpu will work in my motherboard. My motherboard is a Socket LGA775, though. I'm running the latest BIOS (for my mobo) which is version 4.01. That said, I don't think the CPU is listed on any documentation. I'm worried that it won't work .. and if so .. why would that be?! The mobo is around 8 months old, i think.


  • Related Answers
  • Stefan Thyberg

    The processor probably just wasn't out when the motherboard was made, it should work fine.

    CONFIRMED: It's compatible with all Core 2 Quad processors.

  • 8088

    Confirmed from the ASUS page for your board:

    enter image description here

    enter image description here enter image description here

    LGA775 Intel® Core™2 Processor Ready This motherboard supports the latest Intel® Core™2 processors in LGA775 package. It also can support Intel® next generation 45nm Multi-Core CPU.

    The CPU-Upgrades list for your motherboard: ASUS P5N-EM HDMI,
    last updated Mar 2, 2009, does not show Q8400, though it shows E8400.

  • JFV

    Here's's product page for this motherboard. It looks like you should be able to use your new CPU!

    Here are the Cliff's Notes:

    Supported CPU
    CPU Socket Type     LGA 775
    CPU Type    Core 2 Quad / Core 2 Extreme / Core 2 Duo
    FSB     1333/1066MHz
    Supported CPU Technologies  Hyper-Threading Technology