Hello Dmitri, As with most notebooks your VGN-SZ650N a video card upgrade is not available. Your laptop does feature two video chips already, one for performance and one for battery life. If you want more video power in a notebook check out our new notebook offerings at SonyStyle.com. We now have more than 10 different forms to choose from.
Dmitri, The VGN-SZ650N is a vista 32 business. Unless you upgraded to Vista 64, the Vista 32 OS will only be able to use 3.12GB of RAM. If you were to upgrade your ram, it would be worthworthy to upgrade to a total of 3GB of ram unless you plan to upgrade your Vista OS to 64 bit.