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The maximum supported officially is 4GB, but you can use 6GB in the MacBook and it will work fine.

I wasn't aware of that. What the earliest macbook that can handle 6 GB?

But is it really worth it, considering the huge price tag and the loss of dual channel memory acces? I wouldn't have though so.
 
That still does not answer my question. Let me re-ask; How do I set up the RAM so that I have 6gb and it is installed in an optimal way with that particular hardware ?
 
That still does not answer my question. Let me re-ask; How do I set up the RAM so that I have 6gb and it is installed in an optimal way with that particular hardware ?

You would need to get a 4gb ram stick and a 2gb one, preferably both from the same company. As the MacBook only has 2 slots for ram.
 
OP, why would you need 6GB, is there a certain program that needs all that RAM? Adding 6GB could make your macbook unstable and prone to crashes. I have 4GB in my uMB and I couldn't see why I would need any more, even when using memory intensive programs. I would just go to macsales.com and order 2x2GB RAM sticks for the white macbook. This should be plenty for just regular use and will be a lot cheaper.
 
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