Padarathsean :
Also what size graphic card would be good? I have a 1gb radeon
You need to specify in your first post that you are talking about video memory, not system memory. The hint that hinted this to me was that you said "radeon".
Now what you need to know is that ram size in a video card is generally irrelevant and has nothing to do with the performance of the card.
Now, would you care to give us more details on your situation, your system setup, and what you need?