Zoong PHAM a icrit , Le 9/04/08 6:20:
quoted text
> My new Thinkpad x61 has 4 GB of RAM.
> The BIOS can see 4 GB.
> OBSD-4.2 and 4.3 (snapshot 07/04/2008), both i386 and amd64, can see
> only 3 GB.
> What can I do to make OBSD see all the RAM?
> 
> FYI, the Windows XP that preinstalled by IBM can also see only 3 GB.
> 
> Thanks,
> Zoong PHAM
> 
> 

http://www.dansdata.com/askdan00015.htm
"If you install 4Gb, there is no way to make all of the RAM between 3Gb 
and 4Gb available without installing a 64-bit OS, which you can't do 
unless you have a 64-bit CPU. And even then it won't necessarily work.

So, to avoid hassles on current systems, it's best to stick with 3Gb or 
less."

I don't really know if this is the real explanation.
If not sorry for the noise