I have 4GB DDR2 800 memory at the moment and an E8400 processor and am running Windows XP Home 32-bit. I have Windows 7 on pre-order. My question is, will there be a noticeable difference in performance when I install Windows 7 64-bit if I get an additional 4GB of memory? Just wondering if it is worth the extra $75 to get 4GB more memory. I play older computer games, do internet tasks, have music streaming in the background, etc. Thanks for any opinions.