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Ok - who has experience on this or even running a system with unequal DDR3 chips at different frequency. I asked OMC already and they said that the 2GB(1066) + 8GB(1066) setup will run. The best would be to get one 8GB chip from OMC - unfortunately I didn't know about this before. The Apple homepage tells me that a MAcBook Pro 7.1 can handle up to 16GB. Soooo - The question ist now if I could use 2GB(1066) + 8GB(1600) or 8GB(1333)īecause it will be much easier to exchange the two 4GB with one 8GB with our dealer - then finding two 4GB(1066). Here it's almost impossible to get chips with 1066MHz (tried Mercado Libre - like the Amazon of South America) 1333MHz is possible - but no 1066Mhz available. The problem is - I am in Peru and it's a friends computer. The startup take some more time - but this could be something else as well. I was working a little with the computer and everything seems to be fine.

The system starts and gives me 6GB at 1066Mhz. So I just entered one 2GB(1066MHz) + one 4GB(1600MHz).

I soon found out, that the frequency is the problem. So I installed the two chips and nothing happened after I press the start button. The dealer told me that it will work with any MACBook. I bought two Kingston KVR16LS11/4 - with 1600MHz. I got the latest El Capitan running and even with just 2x2GB it's running actually very good. I wanted to upgrade my MAC Book (mid 2010 - 7.1) with 2x4 GB Ram chips from Kingston.