Increase memory of video card???

hello
I have macbook with 2 gb of rams and 256 mb of video ram ,,, If I upgrade ram to 4 gb, does video ram will increases to 512 mb or still 256mb?
Does macbook supports 6gb of rams,,, I read from some forums it support 6gb as (2gb-4gb)???
sorry for bad english

cph2133 wrote:
No you can't have 6 GBs of RAM (2+4) I believe the ram size has to be identical for the two cards 1+1 or 2+2. At least that's how it was with my old dell so I assume it's a ram thing not a computer thing.
This is incorrect, you can have a 4+2 for a total of 6GB. I did read an article in MacWorld that stated the MacBook won't take advantage of 6GB right now, but it will operate and report 6GB.
Also, the video card won't use anymore than what the card is rated to use despite increasing your RAM size.

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