16GB RAM installed, Windows recognises it as 12GB and says only 7.98Gb is usable.

I have 2 sticks of 1600mhz DDR3 RAM installed however when using dual channel ram slots (1-3, 2-4) windows only recognises 12GB and says only 7.98 is usable. CPU-Z says I have 16GB installed and when I put the ram sticks next to eachother (slots 1-2) I'm back to 16GB so don't think its a hardware error. Any ideas of what I could do?
7 answers Last reply
More about 16gb ram installed windows recognises 12gb 98gb usable
  1. The amount of ram you can install depends on your Mobo. List full system specs
  2. CPU: AMD FX-8320
    GPU: ZOTAC GTX 970 4GB
    MOBO: Gigabyte-78LMT-USB3
    PSU: Corsair CX600
  3. bump^^
  4. shutthewindow said:
    CPU: AMD FX-8320
    GPU: ZOTAC GTX 970 4GB
    MOBO: Gigabyte-78LMT-USB3
    PSU: Corsair CX600


    I think you will find the GTX 970 is also accessing 4gb shared RAM which will account for the discrepancy in your installed and Windows RAM figures. You can see the resources the GTX is using if you have the NVIDIA control panel. Right click on the desktop and select 'NVIDIA control panel', then when the panel opens select 'system information'. Ensure the display tab is selected and scroll the details window and you will see 'shared system memory: 4094MB
  5. tony.sleight said:
    shutthewindow said:
    CPU: AMD FX-8320
    GPU: ZOTAC GTX 970 4GB
    MOBO: Gigabyte-78LMT-USB3
    PSU: Corsair CX600


    I think you will find the GTX 970 is also accessing 4gb shared RAM which will account for the discrepancy in your installed and Windows RAM figures. You can see the resources the GTX is using if you have the NVIDIA control panel. Right click on the desktop and select 'NVIDIA control panel', then when the panel opens select 'system information'. Ensure the display tab is selected and scroll the details window and you will see 'shared system memory: 4094MB

    I checked and it turns out its using 8190MB which I assume is 8 gig. It's strange that it's using that much, is there any way to reduce that?
  6. shutthewindow said:
    tony.sleight said:
    shutthewindow said:
    CPU: AMD FX-8320
    GPU: ZOTAC GTX 970 4GB
    MOBO: Gigabyte-78LMT-USB3
    PSU: Corsair CX600


    I think you will find the GTX 970 is also accessing 4gb shared RAM which will account for the discrepancy in your installed and Windows RAM figures. You can see the resources the GTX is using if you have the NVIDIA control panel. Right click on the desktop and select 'NVIDIA control panel', then when the panel opens select 'system information'. Ensure the display tab is selected and scroll the details window and you will see 'shared system memory: 4094MB

    I checked and it turns out its using 8190MB which I assume is 8 gig. It's strange that it's using that much, is there any way to reduce that?
  7. The only method I am aware of to reduce video shared memory is via your computer BIOS settings. I have the same motherboard as your self. You may have the 'integrated video device' enabled on your system. It is worth checking your BIOS settings to ensure you are not using shared memory with that device and have it disabled. On my own system I have a 2GB NVIDIA Geforce card and it enables 4GB shared RAM. I cannot find any setting to change this value. Perhaps, and this is pure conjecture, NVIDIA cards reserve 2x on board video RAM in shared memory. Hence, for me, 4GB and for you 8GB.
Ask a new question

Read More

Windows RAM Dual Channel