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I've been wondering for a while, why does my system indicates that only 3.87 GB of RAM are usable out of 4 GB? I do run a 64-bit OS. Windows 7 Home Premium 64-bit.

Can anyone tell me why I cannot use all my RAM even if the OS is 64-bit?


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asked Oct 30 '10 at 00:12

Gabriel%20B's gravatar image

Gabriel B

Your operating system, Windows, is permanently using the unusable portion. It is reserved, because it needs it, for kernel use.

answered Oct 30 '10 at 00:17

popman's gravatar image


edited Oct 31 '10 at 21:58

Oh I see now, so it's either the GPU, the Intel HD graphics integrated into the Core i3 CPU I have, or Windows using it for Kernel use. Alright, thanks everyone for those precise answers! :)

answered Oct 30 '10 at 14:19

Gabriel%20B's gravatar image

Gabriel B

Onboard integrated graphics, or lets say Integrated Graphics Cards, that are soldered onto the motherboard will take some memory from the RAM to be able to run, which will leave with you with a little less, then what you have installed.
I hope this helps you out, if you are still confused, just let the community know. :)

answered Oct 30 '10 at 01:58

Jim's gravatar image


I have 4 GB RAM to and it does that even on Mac. 3.75

answered Oct 30 '10 at 14:46

ryebread761's gravatar image


IF you have an AMD/nVidia Graphics card, they will reserve memory. Think your self lucky, my old laptop reserved an entire GiB

answered Oct 30 '10 at 01:37

Tim%20Fontana's gravatar image

Tim Fontana


This is only true for onboard/integrated graphics cards. A dedicated GPU will likely have it's own memory and address space, separate from typical RAM.

(Oct 30 '10 at 01:39) Seb Seb's gravatar image

I had a ATI Mobility Radeon 4200 and it did this, and I have a friend with a mr 5470 with the same thing. I spoke to ATI, and they said their AMD chipsets do this for the GPU

(Oct 30 '10 at 01:41) Tim Fontana Tim%20Fontana's gravatar image

my 4200 had 256 dedicated

(Oct 30 '10 at 01:41) Tim Fontana Tim%20Fontana's gravatar image
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Asked: Oct 30 '10 at 00:12

Seen: 3,054 times

Last updated: Oct 31 '10 at 21:58