Running pairs of RAM in that motherboard isn't going to help anything. The KT400 chipset doesn't support dual channel, so performance will be the same with 2 sticks or 1. You probably won't get your FSB much higher if any with new RAM. That motherboard officially supports up to a 166 FSB. I have seen them overclocked to around 180. You already have an FSB of 175, so at the most you might see a 10 MHz increase with faster RAM. If you are planning on upgrading in the future to something like an Nforce 2 motherboard, buying the RAM wouldn't be a bad idea, because they support higher FSB speeds and dual channel.