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well ow sell an 8gb kit and i have spoke to a few guys ha have got 8gb in there macbook. apple only support up to 4gb but the chipset can use 8gb according to a lot of people.
 
This is what I am concerned about. This true or just trying to sell their product?

Your Apple MacBook New Unibody Plastic 13-inch (DDR3) 8GB Memory only supports memory modules made with a specific type of chip. Should you find what seems to be the exact same memory modules elsewhere for a lower price, it is very possible that the cheaper memory modules will not work in your system. By using Memory-Up's Memory Finder, your selected memory modules are Guaranteed To Work or your money back.

from
http://www.memory-up.com/Memory/AppleMacBook9770.html#
 
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