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Zcythe · Posted: Tue Aug 16, 2011 1:52 pm Post subject: Weird laptop memory problem

My friend has a laptop with windows 7 64bit and he has 4 gigabytes of ram installed, But it says only 3.75gb available, and this confuses me because he has a 64 bit OS. Anybody know how to fix this? or if its just a visual glitch? thanks

Dark Byte · Posted: Tue Aug 16, 2011 2:22 pm Post subject:

In the bios specify that you have a 64-bit os

DamiPL · Posted: Tue Aug 16, 2011 2:33 pm Post subject:

i don't know if thats the case here but it may be that, that RAM is dedicated to the GPU, i have the same thing in my netbook.

Zcythe · Posted: Tue Aug 16, 2011 2:34 pm Post subject:

EDIT: Nevermind it was the GPU using memory. I'm dumb.

Saifallofjmr · Posted: Tue Aug 16, 2011 11:31 pm Post subject:

Dark Byte · Posted: Tue Aug 16, 2011 11:38 pm Post subject:

no, I meant bios.
Some bioses have an option to specify if you have a 32 or 64-bit os

If 32-bit os it will make the e820 memory map only show the 32-bit address regions so systems that don't expect 64-bit memory to be present won't flip out (e.g a badly written os might store the regions in 32-bit variables, and if it reads 0x1000c0000 with size of 65535 bytes to be writable, it reads that c0000 is writable instead, which is a bad thing...)

But in this case it's just the crappy laptop graphics chip that doesn't come with it's own memory

Saifallofjmr · Posted: Wed Aug 17, 2011 3:31 am Post subject: