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Nope it won't work.
1. It's just this month that the macbook started supporting 4gb of memory.
2. The current line up uses pc2-5300
 
it will work, but the macbook can only address 3 gb and it will only use it at pc2 5300. but since they are matched pairs you will have a grahics/ preformance boost compared to 1gb+2gb
 
well, i though, pc2 6400 still run on macbook.. (backward compartible).
The questions was .. would it run ..
i know, i just dont have the benefits to have pc2 6400 ...
(i'm not really sure bout this actually) hehehe
 
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