P750DM3G replacement mainboard not working with previous memory

Discussion in 'Sager and Clevo' started by philstopford, Nov 5, 2019.

  1. philstopford

    philstopford Notebook Consultant

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    Recently, the mainboard in my Clevo P750DM2G died. I replaced it with a P750DM3G board from eBay. This has exhibited a really odd problem.

    When I took possession of the DM2G machine, it had 32 GB RAM (2x16GB 2666) fitted in bays 1 and 2 (under the keyboard). I bought identical modules (Corsair Vengeance) to take the machine up to 64 GB and this was working fine throughout. The memory has been used fully at various points, and has previously passed memtest runs so I don't think there's any issue in the modules.

    The replacement board seems to be only able to bring up the BIOS screen and boot with 32 GB RAM; the only bays that seem to work for this are 1 and 3. Any other configuration fails to bring up the BIOS logo and the machine seems to keep cycling through the BIOS stage (it powers up, keyboard lights up, fans spin up and then go to low RPM; after 30-60 seconds the machine power cycles - the screen is black the whole time).

    Has anyone seen or heard of something like this before?

    EDIT: 2600 was a typo; those modules are labelled as 2666
     
    Last edited: Nov 6, 2019
  2. jaybee83

    jaybee83 Biotech-Doc

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    check and see if the problem persists with one single RAM stick in all four slots. if that is still the case, then:

    1) your replacement mobo might be defective at the two RAM slots
    2) either your CPU IMC or your socket or your CPU to socket connection might be wonky, hindering the RAM to function properly
     
  3. Meaker@Sager

    Meaker@Sager Company Representative

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    1 and 3 would be single channel, does one stick only in either 2 or 4 work?
     
  4. jc_denton

    jc_denton Notebook Deity

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    Try resetting the bios and see if it'll train.
     
  5. philstopford

    philstopford Notebook Consultant

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    So I raided a couple of other machines for their 2400 RAM (2x16 GB modules, 1x8 GB). These modules so far seem to work in any slot and combination. I guess the current board is very fussy about the 2666 RAM. Is there perhaps a way to make the 2666 memory work, or is a fussy board likely just to be permanently problematic.

    Eventually, my plan is to take the 6700K in the system and replace it with a 9700K - I don't know if that will have any bearing on the memory situation.

    EDIT: Same typo as in original post. 2600 should have been 2666
     
    Last edited: Nov 6, 2019
  6. Meaker@Sager

    Meaker@Sager Company Representative

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    The stronger memory controller can help but it depends.
     
  7. jaybee83

    jaybee83 Biotech-Doc

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    just to be clear: are we talking about actual 2600 sticks or 2666 and ure just keep saying its 2600 "class"? that might be important cuz ive noticed before in some instances that the mobo is fussy about using non-standard speeds, i.e. there is no standard speed between 2400 and 2666 mhz for so-dimms. so anything in between those would mess up the system.

    Sent from my Xiaomi Mi Max 2 (Oxygen) using Tapatalk
     
  8. philstopford

    philstopford Notebook Consultant

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    Apologies - it's labelled as 2666 memory. This is where I'm up to at the moment in terms of working configurations :

    Bay 1 and 3 (16 GB 2666) : total of 32 GB RAM
    Bay 1 and 2 (16 GB 2400) and Bay 3 (8 GB 2400) : total of 40 GB RAM
    Bay 1 and 2 (16 GB 2400) and Bay 3 (8 GB 2400) and Bay 4 (16 GB 2666) : total of 56 GB RAM
    Bay 1 and 2 (16 GB 2400) and Bay 3 (16 GB 2666) and Bay 4 (8 GB 2400) : total of 56 GB RAM

    It's really strange.
     
  9. Meaker@Sager

    Meaker@Sager Company Representative

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    Have you made sure the bios is up to date?
     
  10. philstopford

    philstopford Notebook Consultant

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    BIOS is 1.06.11
    KBC/EC is 1.06.06
     
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