The std. here is goto the http://www.crucial.com and enter your pc data to locate the type of ram you need. The info supplied is pretty on target and provides the details of what ram and type can be used plus the amount. You can also check your manual or docs on the details of your PC on similar details. That way no guessing, it spelled out for you.
I bought today one 4GB DDR3 1333 MHz memory module.
I was told that 1333 instead of 1066 MHz is OK because the ram will just run slower..
But is it OK to have only one RAM module ? Or shall I keep one of the original 1GB module? (to make a total of 5 GB).
Reason I'm thinking of going 4GB instead of 5GB is that I heard that the mini is not good beyond 4GB . Is this true ?