Ram upgrade

[sudcell]

Hi guys
I currently have 2Gb x 2 sticks of RAM

I am planning for a small upgrade to change one of the 2GB sticks with a 4GB stick so as to get 6GB of RAM

Both sticks are KINGSTON DDR3 and i don't know the MHZ!!

Attaching a pic for reference
http://imgur.com/BHiLR2G

I want to know that whether i should get the exact same stick of 4GB or can i go for some better one too?

Thanks in advance

 

[Cromewell]

Looks like 1333. You could spend a little more and get better RAM if you want.

I wouldn't trade a single 2GB for a 4GB stick, it works better in matched size pairs.

 

[sudcell]

Looks like 1333. You could spend a little more and get better RAM if you want.

I wouldn't trade a single 2GB for a 4GB stick, it works better in matched size pairs.

Bought a 4Gb stick!
actually one of the sticks was acting crazy.
So I went in to get the replacement and I was told that it will take at least 90 days for the replacement to arrive.
So had no other option than getting a new one!