So my local store here in Asia sells these 4gb ram modules for something like $48 USD each but the part numbers are as follows: KVR1333D3S9/4G FOR PC1333 this would be for the 2011 mbp 13" KVR1066D3S7/4G FOR PC1066 and this for mid 2010 http://www.ec.kingston.com/ecom/con...ww.kingston.com/asia&ktcpartno=KVR1066D3S7/4G The link is what I got for searching the 1066 version... now if I search by model of my mac I get a different part number and also doesnt list all the details KTA-MB1066/4G and KTA-MB1333/4G. Is there a difference? I was told that the above ones are valuram and the KTA ones r specific to the system.. now my question is since they dont list the tech specs for the KTA ones online how can I compare? If I go by a 3rd party website http://www.ramcity.com.au/product/KIN1-AMKPRO-4G-07.htm it reads exactly the same. I prefer to buy local if possible then I would not have to deal with shipping etc.