I am planning to upgrade my RAM.So which one would be best?Should I just buy another identical 512RAM and make it 1gig in dual channel or should I buy another 1gig of RAM from the same company of same speed and make it 1.5gig.Which one will be faster.What I have heard is dual channel only gives 10% performance boost than normal one.So what should I do?512 or 1gig?Don't tell me to buy 2 gigs coz now I have very limited budget.