4G Memory Only Recognised 3.4G

[Soo-Hyun Choi]

Hi, David,

Thanks for your reply.
Your information is very helpful.


> 
> check your BIOS for a setting to enable PAE.  you may need to upgrade 
> the bios on your motherboard.  do you dual-boot?  if so does your other 
> OS see all the ram?
> 


No dual-boot in my system.


> get into the grub menu, check if the memtest sees all 4gb.  does it?  if 
> so your BIOS is good to go and you have an OS problem.  if not report 
> back and we may be able to shed more light.
> 


Yes, the memtest sees all 4GB of RAM.


> does your video card share RAM with your system?  sometimes they 
> automatically take more when the BIOS detects you've installed more RAM. 
>   check this in the BIOS.  btw what type of system are we talking about 
> here?  laptop?  desktop?


I have a separate video memory in a PCI-E vidoe card, so main memory is
not shared for it. My system is a desktop system.


> 
> i asked the oracle about your question, it coughed up this link:
> 
> https://answers.launchpad.net/ubuntu/+source/linux-meta/+question/13808
> 
> ...among 283,000 others.  :)
> 
> http://www.google.ca/search?q=4gb+ram+ubuntu
> 



I will explorer these links, but I am still not quite sure how I make my
system see all 4GB memory. T_T



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