How much RAM will my Macbook Pro take?

Question

6 or 8 gigs????????
Here are the exact specs:
I think it's an early 2008 model (I bought it used)
Mac OS X, Version 10.6.8
2.2 GHz Intel Core Duo
Currently 4 GB 667 MHz DDR2 SDRAM
Macbook Pro 3,1
Model Name:          MacBook Pro
  Model Identifier:          MacBookPro3,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.2 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          4 MB
  Memory:          4 GB
  Bus Speed:          800 MHz

Answer 1

If you put a 2GB and a 4GB stick in together, your MBP will use all 6GB the same way it would use 4GB, except that there will be a small performance penalty because the modules are not matched. That will be more than offset by theperformance benefits of having more RAM, if you actually need it. If you don't need it, there won't be any benefit from the upgrade.
I read this too.  I read that when you do a 4 gig and 2 gig card, your processor won't be able to work off of the ram simultaneously.  The processor will have to choose one or the other.
Where'd you get this? I think it's nonsense.
Oh, and there are no 3GB RAM modules.
Message was edited by: eww