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    XPS l702x 3D Dual Channel Memory Problem

    Discussion in 'Dell XPS and Studio XPS' started by hugphot, Nov 26, 2015.

  1. hugphot

    hugphot Newbie

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    I have an l702x 3D with 4 memory slots, 2 of which are occupied by the original 2x4GB Dell modules. I'm running the modified A19 BIOS with UEFI enabled & Win8.1 Pro x64 installed in UEFI mode. When I ran HWiNFO64 or CPU-Z I noticed that the memory was running in single channel mode - if the laptop is positioned so that the hdd bays are at the bottom, memory slots at the top, both modules were in the left hand pair of slots (From HWiNFO64 I can see that the left hand slots are channel B & the right hand slots channel A.) Both pairs of slots are labelled as A and B - there is no C or D so I assumed a labelling error. I swapped the modules in an attempt to get it running in dual channel mode but no luck - the laptop wouldn't boot, just a black screen & some error beeps. Now that I have a list of what the beeps mean I tried to count but it doesn't beep anymore - just the black screen until I swap the modules back & everything works ok. What I have found is this: If there is a memory module in either or both of the left hand side slots (Channel B), the laptop starts up fine. If I put memory in either of the right hand slots (Channel A), I get just the black screen & the fans go to max speed. It makes no difference if there is memory in either of the left hand side slots at this time.

    Any help would be much appreciated as I can't find any reference to this problem anywhere despite much searching & would like to eventually increase the RAM by using all 4 slots.
     
    hugphot, Nov 26, 2015
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  2. kent1146

    kent1146 Notebook Prophet

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    I wouldn't worry about it. There isn't any real world performance difference between single channel and dual channel memory.

    So even if you got it running into dual channel mode, you wouldn't notice a difference.






    Sent from my XT1575 using Tapatalk
     
    kent1146, Nov 26, 2015
    #2