I'm getting my old PC up and running so my mom can use it for her daily online stock trading she's started recently. Now, its a Pentium 3 ,800 MHz, running Win XP SP2 on 256 MB RAM. (SD RAM, not DD RAM) It'll be used for browsing and playing movies. Rarely, for rencoding avi files to burn onto media. So my question is, will increasing the RAM to 384 MB (one chip of 256, and another of 128) make any significant difference over having just 256 MB RAM? I need to know since SD RAM is more expensive than DD RAM, and I don't want to blow my money on 128 extra MB if it isn't going to make a significant difference. One of my friends tells me that 128 to 256 is a big difference, but 256 to 384 can actually degrade performance due to having two sticks instead of just one.