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Windows doesn't recognize all the ram (3 sticks, different size)

Hello there, I admit it I am new to building computers however I finally got my first build up and running, however there is an issue with the ram.

Bios/CPU-Z and even dxdiag imply that the amount of ram installed is 12gb (Got 1x 8gb and 2x 2gb sticks), however on windows system priorities it stands ''12gb installed (3.93gb usable)'' or so, I have got it up to 10 gb out of the max 12 by swapping ram spots about.

I have tired everything described in this guide by windows : http://support.microsoft.com/kb/978610

Along with few other things I found on the internet, yet I got no clear answer if it is even possible to get all the sticks to work.

The motherboard I have is rather new and by gigabyte : http://www.gigabyte.com/products/product-page.aspx?pid=4396#ov

The ram sticks are as follows:

Corsair Vengeance 8GB DDR3 1600mhz quad-channel.

2x Corsair Vengeance 2GB DDR3 1600mhz

All of the ram sticks are CL 9

I am aware that by changing sockets you may get it to work, however I am not sure which stick to put in which socket, at the moment I have 8gb on slot 1 and the 2gb sticks in slot 3-4 which results in 4gb usable ram listed by windows.

Also: I am running Windows 7 64bit so that should not cause the issue, and as said I have gotten it up to 10gb out of the maximum 12, by switching slots about.

Edit: Just tried again by having the 1gb on slot 1 and 2gb on slot 3 which did work out fine, as windows even sees it as 10gb ram, however when I add the one 2gb stick more windows doesn't see it as usable ram, could it be broken? - I doubt so as earlier I was going with 4gb.

Any suggestions?
6 answers Last reply Best Answer
More about windows recognize ram sticks size
  1. Adjust the ram size maximum using the msconfig utility in win 7.
  2. Tried to do both, check the box so it won't limit the maximum ram and to limit the maximum size to the 12gb, no effect after restart windows still won't see it all as usable.
  3. Best answer
    MB Manual, Pg 16.
    .. "It is recommended that memory of the same capacity, brand, speed, and chips be used."
    and Channel A = Slots 2 & 4, Channel B = Slots 1 & 3 (Slot 4 closest to CPU)
    .. That said:
    Prefered install would be Slot 2 and 4 for your two x 2gig modules and slot one for the 8 gig module.
    Can also try - Slot 2 = 8 gig module, and slots 1 and 3 for the 2 x 2

    You may be creating a problem by tring to run One channel in daul channel mode and one channel in single channel mode.

    Next, What Bios FW version are you running.
    .. FA= orgininal
    .. FB improved Memory Compatability
    .. FC = latest.

    Personally I'd recommend buying a duplicate of your 8 gig stick ( 2 x 8 in slots 2 & 4) and puting the 2 x 2 Modules in storage for use if a problem developed with one of the 2 8 gig sticks.

    DON'T forget to run Prime 95 to verify no memory errors - Monitor you cpu temperature as Prime 95 loads CPU, Can also monitor your +12 V to verify => 11.6V (spec is 11.4V) and that the diff between Idle and runing prime 95 the +12 V does NOT drop more than 0.3 V.
  4. Alright, could've sworn I read the manual properly. Oh well, that explains a thing or two, however I am sure the 10gb I have up an running: I did update the bios so that shouldn't be an issue.

    Yes I think I will go with that, just buying a duplicate stick of the 8gb one as it has cooling to it aswell (not that it's a huge problem).

    Thank you for your help.
  5. ^+1 @RetiredCheif
  6. Stated already " Also: I am running Windows 7 64bit"
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