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Toshiba laptop says it is only 3GB is usable from 4GB what does it meen

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Anonymous
a b D Laptop
a b V Motherboard
December 30, 2010 5:12:14 AM

Hello,
i install 4GB but it says only 3gb is usable

More about : toshiba laptop 3gb usable 4gb meen

a c 156 V Motherboard
December 30, 2010 7:10:26 AM

You probably have a 32 bit version of Windows. A 32 bit CPU has a 4 GB address space. But Windows CPU's use part of that address space for something called "memory mapped i/o" (google the term). That reduces the amount of memory that the CPU sees. If the motherboard depends on chipset graphics, that further reduces the amount of memory that Windows sees.

Entering the BIOS will tell you what the system sees. That should be 4 GB .
December 30, 2010 3:57:09 PM

^^ Agree.
Also, your system with a 32 bit OS will only USE 3.25GB of RAM. (I think it was .25)
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a b V Motherboard
December 30, 2010 5:38:01 PM

32 bit windows supports 4GB max. You will see between 3-3.5GB. If you get a 64bit OS, it will give a full 4GB.
June 24, 2011 6:43:49 PM

blackhawk1928 said:
32 bit windows supports 4GB max. You will see between 3-3.5GB. If you get a 64bit OS, it will give a full 4GB.


I installed Windows 7 Enterprise on the same model laptop (a135-24487) and it was telling me the same thing, only 3gb usable of the 4gb memory installed. I waited specifically till I had a 64-bit version of Windows before upgrading the ram to be sure it would be worth if by having my laptop use all the ram possible.

Could there be a bios setting that needs to be changed to have it use all 4gb of ram? It sees all 4, I just can't figure out why it wouldn't use all 4?

Thanks in advance!
June 24, 2011 10:52:39 PM

Hi kiliki,
If you have 64bit installed, than it is a bios issue. If youre laptop was intended for 32bit and they haven't released a Bios update, than youre out of luck. I had a similar problem with an Asus board of mine. I installed 8gb and it showed 3.99 usable. They came out with a Bios Update to fix the memory problem thankfully. But yea you need to check if your bios is up to date, and if there is a newer version, flash it. If there is not, youre out of luck.
!