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Why more VRAM is needed in GPU?

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#1
I have seen many members in forums has 4GB HIS 7850 gpu(example)
why do they need more VRAM?
What would be if they take 7870 1gb,7990 1GB instead?any performance difference i mainly want to know.
 
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#2
For frame buffering in ultra high resolution and/or multi monitor setups. In some cases the configuration of the GPU doesn't even make sense though. There are fairly weak video cards that have been made that lack the raw power to make use of the VRAM they have. Conversely once in a while you'll see a card with more power than it can make use of due to limited memory bandwidth, which is why the old Ti 4200 could hold it's own against the 5700. With video cards you have to consider how well balanced they are. It's not just a matter of picking out one with an appropriately powered graphics processor for your system.
 
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#3
What Frag Maniac said and also MSAA 8x and higher eats lots of VRAM and uses up lots of video memory bandwidth
 

erocker

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#5
Nope! Frag Maniac described it nicely .:)