MacbookPro RAM?

[velcade6]

Hi,
1. I have a MBP (early 2011) with 2x4GB memory modules. I was wondering if buying an 8GB RAM, could I use it together with one of the 4GB modules so there'd be 12GB RAM? Will it work?
2. IF the above installation were ok: should the MHz of the 4GB module match the Mhz of the 8GB module? Or it doesn't matter?

 

[rapicell]

As long as you get the correct ram (same type as the 4gb), then yes, it'll work together as 12GB of ram