256 vs 512

I am about to buy a notebook and looking at dell has ati 4570
I wanted to ask wether there is any significant difference between 256mb or 512mb memory for this card???
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    512 will help it out significantly, the added Vram will be very useful for any resolution above 1024x768 which most laptops are. The 4570 is a mobility so expect medium -low settings at best as it isnt even as strong as a 4650.
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