Windows 7 - 64bit 4gb installed 3.12 usable?

**Boris** · 06-03-2009

Hi all,

I have Windows 7 installed with 4gb, but only 3.12 is usable.

How come? Any ideas out there?

**stormy13** · 06-03-2009

Without knowing your system specs can't point you in the right direction, but check in the bios for a setting having to do with memory remapping. Depending on the motherboard and/or who built the computer, it may not be there and if it isn't then you're stuck with what is available unless there is a bios update that will allow the option.

More info here,

http://support.microsoft.com/kb/929605

Quote:

The BIOS must support the memory remapping feature. The memory remapping feature allows for the segment of system memory that was previously overwritten by the Peripheral Component Interconnect (PCI) configuration space to be remapped above the 4 GB address line. This feature must be enabled in the BIOS configuration utility on the computer. View your computer product documentation for instructions that explain how to enable this feature. Many consumer-oriented computers may not support the memory remapping feature. No standard terminology is used in documentation or in BIOS configuration utilities for this feature. Therefore, you may have to read the descriptions of the various BIOS configuration settings that are available to determine whether any of the settings enable the memory remapping feature.

**zigzag3143** · 06-03-2009

boris
I think you prob have a 32 bit system and maybe even shared video. the max a 32 bit can "see" is abt 3.5 gig and hware may even eat a little bit more. Mine does.

**Ajulian** · 06-04-2009

Problem using 4gb in 64 bits

**Boris** · 06-04-2009

Ah, thx for the info i will investigate. Sorry for the repost.

**Ealezy1992** · 12-11-2009

i had the same problem. In the morning i had 4gb of ram installed and working by evening only 3 working (4 showing). Now i had installed updates earlier today so i thought that might have something to do with it. i tried a few solutions on here nothing worked for me. i checked bios, it was fine. when I restarted my pc msn started so i went into msconfig to switch it off in startup(type msconfig into run) out of curiosity i clicked on boot-> advanced options and for some reason the box maximum memory was checked. so i unchecked it and restarted and now i have 4gbs again. I think one of the security updates must've have ticked the box. But try this anyway, i hope it works for you

**Ajulian** · 12-11-2009

i change my mobo and now im using 8gb instead of 4 with no problems
i guess i was having that memo limit because of chipset
anyway
thx all

**jtrag** · 05-13-2010

Quote: Originally Posted by Ealezy1992

i had the same problem. In the morning i had 4gb of ram installed and working by evening only 3 working (4 showing). Now i had installed updates earlier today so i thought that might have something to do with it. i tried a few solutions on here nothing worked for me. i checked bios, it was fine. when I restarted my pc msn started so i went into msconfig to switch it off in startup(type msconfig into run) out of curiosity i clicked on boot-> advanced options and for some reason the box maximum memory was checked. so i unchecked it and restarted and now i have 4gbs again. I think one of the security updates must've have ticked the box. But try this anyway, i hope it works for you

THIS WORKED FOR ME! Thanks!

I have 12GB and Windows 7 x64 Ultimate was only showing 10GB usable. I unchecked that box in msconfig and restarted the computer, and now it's back to normal (All 12GB of RAM is available now). Thanks again!