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    How much RAM can my mobo handle?

    I have a 64 W7 PC so can take as much RAM as I want (in theory) but my mobo doesn't seem to like it.

    I have 2 x 2GB X Brand and 2 x 2GB Y Brand sticks in XYXY format (as colour coded on my board) but only the X brand are being shown in Windows, CPUz and the crucial scan.

    I have CPUz which shows as single channel and 4GB but my mobo specs (https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/) show 4 slots for 8GB memory.

    the crucial scan doesn't show the 2 empty slots of RAM (should it?), only shows the 2 full slots.

    Is there something up my with board or bios? I haven't updated the bios since I got the PC.

    21 Comments

    Original Poster

    just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?

    imnotlikeyou

    just checked another pc and scan shows the computer of having 4 slots so … just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?


    Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.

    Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?
    Edited by: "drasim" 14th Dec 2016

    Original Poster

    AndyRoyd

    Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according … Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.



    not SFF, large "full size" case

    Original Poster

    drasim

    Have you checked both X and Y brands work separately and that they are of … Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?



    Yes they both work independently, it seems like the mobo is single channel and not double but still has 4 slots. and are both DD2 PC2 6400 non ecc
    Edited by: "imnotlikeyou" 14th Dec 2016

    It's unlikely that a bios will have been made for a few years, so it may be already up to date but it would be worth checking anyway

    imnotlikeyou

    Yes they both work independently, it seems like the mobo is single … Yes they both work independently, it seems like the mobo is single channel and not double but still has 4 slots. and are both DD2 PC2 6400 non ecc


    The channels don't matter in this context, the ram will just be a little slower. Try it in a different order like XXYY.

    Original Poster

    dcx_badass

    The channels don't matter in this context, the ram will just be a little … The channels don't matter in this context, the ram will just be a little slower. Try it in a different order like XXYY.



    will do, but the scan checker doesn't show my 4 slots (2 full and 2 empty) like my other machine

    uk.crucial.com/gbr…6C3

    The specs for my mobo are game-debate.com/mot…ACh showing 4 slots should be available

    imnotlikeyou

    not SFF, large "full size" case


    HP don't list such an item, only small form factor (SFF), ultra-slim desktop (USDT), convertible mini tower (CMT). Assuming CMT, max = 8GB and the memory configuration can be viewed at page 11 of chunky 21MB PDF at pcarena.hu/pdf…pdf

    Original Poster

    AndyRoyd

    HP don't list such an item, only small form factor (SFF), ultra-slim … HP don't list such an item, only small form factor (SFF), ultra-slim desktop (USDT), convertible mini tower (CMT). Assuming CMT, max = 8GB and the memory configuration can be viewed at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf



    CNET show it as my opening post - cnet.com/pro…cs/
    Edited by: "imnotlikeyou" 14th Dec 2016



    Windows 7 64-bit has some pretty low memory limits of it's own. Home Basic is limited to 8GB while Home Premium is limited to 16GB. That's not the issue here though.

    The Core 2 chips have an external memory controller so it's not likely to be a CPU limitation either.

    imnotlikeyou

    I have a 64 W7 PC so can take as much RAM as I want (in theory)

    drasim

    Have you checked both X and Y brands work separately and that they are … Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?



    Do two sticks work if you put them in the other pair of slots?

    Does it work if you have a single X stick and a single Y stick together?

    What happens if you use a pair of sticks and have them in different colour slots? Does the board operate in dual channel mode?

    imnotlikeyou

    CNET show it as my opening post - … CNET show it as my opening post - https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/


    First spec item on CNET webpage: Product Form Factor - Convertible mini tower

    Original Poster

    EndlessWaves

    [quote=imnotlikeyou]Do two sticks work if you put them in the other pair … [quote=imnotlikeyou]Do two sticks work if you put them in the other pair of slots?Does it work if you have a single X stick and a single Y stick together?What happens if you use a pair of sticks and have them in different colour slots? Does the board operate in dual channel mode?



    If I change from X to Y the pc boots up, so the RAM is fine, the issue from what I can see is that nothing is seeing the other 2 slots being used (see my scan report link)

    I can't remember checking if they work alternate colour slots but see above.
    Edited by: "imnotlikeyou" 14th Dec 2016

    Original Poster

    AndyRoyd

    First spec item on CNET webpage: Product Form Factor - Convertible mini … First spec item on CNET webpage: Product Form Factor - Convertible mini tower



    I wouldn't call it a mini tower, it's heavy as hell ha

    Original Poster

    AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).

    We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......

    thanks everyone

    imnotlikeyou

    AndyRoid, using your link, on page 5 it shows the model number and I … AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......thanks everyone


    Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at pcarena.hu/pdf…pdf

    Original Poster

    AndyRoyd

    Please recheck the option of 2 x 4GB as there is no provision for such a … Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf



    The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB

    imnotlikeyou

    The way I read that as that's the initial configuration e.g. this pc came … The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB


    Suggest you proceed with caution as the manufacturer lists only one option for total 8GB and that is 4 x 2GB. Polite repeat to view all the configs quoted by manufacturer at page 11 of chunky 21MB PDF at pcarena.hu/pdf…pdf

    Original Poster

    AndyRoyd

    Suggest you proceed with caution as the manufacturer lists only one … Suggest you proceed with caution as the manufacturer lists only one option for total 8GB and that is 4 x 2GB. Polite repeat to view all the configs quoted by manufacturer at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf



    I was sold this pc about a year ago based on it being able to take 8GB of RAM so if it can't I am going to be mightily **** off.......... hmmmm

    cnet.com/pro…cs/ shows as 4GB installed and Max 8GB so I am going to give it a try, will buy some cheap RAM and see if it handles it.

    Thanks for your help Andy

    imnotlikeyou

    I was sold this pc about a year ago based on it being able to take 8GB of … I was sold this pc about a year ago based on it being able to take 8GB of RAM so if it can't I am going to be mightily **** off.......... hmmmmhttps://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/ shows as 4GB installed and Max 8GB so I am going to give it a try, will buy some cheap RAM and see if it handles it.Thanks for your help Andy


    Excluding physical failures, I have every faith it will accommodate total 8GB, but only in a 4 x 2GB configuration as per manufacturer spec. Consider the Crucial scan that you linked to does not include a 2 x 4GB option which further indicates 2 x 4GB is not supported.
    If you want to cover as many bases as possible, it would be prudent to purchase 4 x 2GB from a reputable source (maybe Crucial), and if the total 8GB of the same brand/type is then not available, you may then have every right "to be mightily **** off."
    My honest opinion for what it's worth: only configure to what the manufacturer states. Your current issue may be that the two brands of memory do not play ball together.

    Original Poster

    AndyRoyd

    Excluding physical failures, I have every faith it will accommodate total … Excluding physical failures, I have every faith it will accommodate total 8GB, but only in a 4 x 2GB configuration as per manufacturer spec. Consider the Crucial scan that you linked to does not include a 2 x 4GB option which further indicates 2 x 4GB is not supported.If you want to cover as many bases as possible, it would be prudent to purchase 4 x 2GB from a reputable source (maybe Crucial), and if the total 8GB of the same brand/type is then not available, you may then have every right "to be mightily **** off." My honest opinion for what it's worth: only configure to what the manufacturer states. Your current issue may be that the two brands of memory do not play ball together.



    I would say that is the case but both CPUz and Crucial don't show the other RAM slots so it sounds like I have the 2 x 2GB (max 8GB) model, will cost me £10 or so from ebay for the RAM so going to give it a try, if not can sell it back on or use it in another machine
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