I am upgrading from 2GB to 4GB maybe as much as 8GB if i switch from windows xp to 7. Is there a performance difference among RAM brands? My home recording laptop (toshiba dual 1.6) is 5 yrs old, and is soon going to be my internet machine. i am holding off for a year on a new computer purchase, to get my money's worth, and see how usb 3.0 prevails. I got 4GB PNY brand in there now, as a test, and it works. it's half the price i paid at big box, from an online vendor. So before i finalize this purchase, i'm wondering if 'brand' matters performance-wise on RAM, and if so, how much/why? Thanks. This question stands for project studios, and pro applications.