Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I've been using my MaBook Pro happily for months but only recently realized that 1 GB is missing. Is there something wrong with my MacBook? It seem to runs fine.

share|improve this question
    
What MacOSX version? I have a very similar problem. Though I could access all the 4GB under MacOSX 10.5 -- I only have the problem since MacOSX 10.6. – Albert May 12 '10 at 22:28
up vote 7 down vote accepted

Usually this is because you're using a 32-bit operating system rather than a 64-bit one.

UPDATE: Apparently, this is a chipset limitation in the earlier Macbook Pros

share|improve this answer
    
No - my wife's MBP can only address 3Gb, and mine can address 4Gb, and we're running exactly the same OS. – Paul Tomblin Jul 21 '09 at 2:07
1  
Updated my answer. – Stefan Thyberg Jul 21 '09 at 2:13
    
Good. Removed my downvote. – Paul Tomblin Jul 21 '09 at 11:00
    
Thanks guys for your answers. – user3092 Jul 21 '09 at 13:45

Which MBP? My wife's 3 year old 15" MBP has a published maximum memory of 3Gb. My 1.5 year old 17" MPB has a published maximum memory of 4Gb.

share|improve this answer

You must log in to answer this question.