MacBook Pro 13,3 and 15,4 : graphic memory

I would like to buy a MacBook Pro but I'm worried about the graphic memory. On the MacBook Pro 13,3 tech specs I can read:
"NVIDIA GeForce 320M graphics processor with 256MB of DDR3 SDRAM shared with main memory"
Shared? Does this mean that the video card hasn't got dedicated RAM?
On the other hand in the MacBook Pro 15,4 tech specs I can read:
"NVIDIA GeForce GT 330M graphics processor with 256MB of GDDR3 memory on 2.4GHz; Intel HD Graphics with 256MB of DDR3 SDRAM shared with main memory"
Please could you explain me what does they mean with "shared" memory?
How about performance? Usually NB has a lot more video memory such as 1GB...

eww wrote:
As I wrote above, I've been doing lots of work in Adobe CS4 applications using the integrated GPU and *its 256MB of "shared" RAM (not really shared, because only the GPU can use it)*. I have 4GB of RAM installed, and I'm getting my work done just fine in 3.75GB of it.
If nothing we can say will reassure you, then you'd better buy some other computer.
Precisely. It appears that the integrated graphics engine has 256MB of dedicated memory available, but it's advertised as "shared" because it comes from the (main) system memory. In reality, it's not the 256MB of graphics memory that's being "shared", it's the 4GB of system RAM that's being shared
And 4GB is plenty of RAM.
Also consider this: the discrete graphic cards available on the 2.4Ghz and 2.53Ghz 15" MBP come with 256MB of dedicated RAM. Only the top two configurations have 512MB of RAM available (the i7 15" and the 17" models).
You should be fine.

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