Win 7 64 bit saying only 3.25 GB Usable?

[Chriz]

I just installed Win 7 64-bit. On the system properties screen for installed memory it says 4.00 GB installed (3.25 GB usable). Why would it say this on a 64 bit OS?

 

[lxskllr]

Do you have a memory remapping option in BIOS? If so, turn it on.

 

[Engineer]

I just installed Win 7 64-bit. On the system properties screen for installed memory it says 4.00 GB installed (3.25 GB usable). Why would it say this on a 64 bit OS?

What motherboard, if you don't mind my asking?

 

[MStele]

Do you have a lower end machine that uses shared memory for its system/gpu?

 

[xSauronx]

Do you have a lower end machine that uses shared memory for its system/gpu?

windows wouldnt show that as available to start with, as far as i know.

 

[Tristicus]

Mine does the same thing. I think it is because it shares memory with the GPU, or the memory remapping thing, which I don't think my system had the last time I checked. And no, I don't have a low end system- Q9300, 4gb DDR2800, 4850 512mb, etc.

 

[Chriz]

I have an Intel P43TF motherboard with the latest BIOS.

 

[Chriz]

I also couldn't find any memory remapping option in the BIOS.

 

[tcsenter]

Check in the BIOS for memory remap/remapping option and make sure its set to enabled.

Run MSConfig

Under boot options -> advanced settings -> Maximum Memory

Clear any check mark if present, click apply then restart the system.

 

[JackMDS]

Do you have any thing that does not work because of this tragically low memory?

 

[Chriz]

There is no checkmark in that section in MSconfig.

There is nothing that doesn't work so far. I can live with it I'm sure, it's just strange how it's acting like it's a 32-bit OS or something, because that's the same amount of memory that Win XP told me was usable when I had that.

 

[JackMDS]

I have an x64 system with onboard graphic. The graphic claims t take 768MB of shared RAM. It probably can be reduced but since it does not bother me I did not spend the time researching it.

 

[lxskllr]

I can't find much info on that board. It's a weird one :^/

 

[Chriz]

Sorry the full name of the board is DP43TF.

This board doesn't even have onboard graphics. I have VT technology and EFI boot enabled in the BIOS, but I would not think that they would cause this.

 

[SemperFi]

I have same OS with 4 Gb memory and it shows 3.75 useable. I have onboard video and assumed that is why it was giving that number. I will reboot here in a bit and see how many meg is alloted to that gpu in the bios.

 

[wgoldfarb]

Wait: OP says that Windows does see all of the 4 GB. His system properties screen says 4GB installed. It if it was a memory remap issue, wouldn't Windows report less than 4 GB installed, regardless of how much of it was "usable"?

 

[john3850]

Using Vista64 and 7-64 retail on my 3 PCs.
Installed mem 4GB Usable 3GB on SLI and Crossfire PCs
Installed mem 4GB Usable 3.25 usable old 88gtx 768 mem.

MSConfig advance will not hold a change on 7 or Vista.
BIOS memory remap/remapping option has no effect and is enabled.
When vista came out I tried to correct 3gig off mem.

Question if ran Crossfire 3 or 4gpu SLI would you loose more mem.