No. Your motherboard is Socket 939, so its DDR only (DDR1 that is). It's not worth the cost to buy DDR1. You'd spend more on another 2GB of it (or 4GB that matches even, since it HAS to match on 939) than you would on a whole new setup (mobo, RAM, CPU).
so really, there isnt much left to upgrade on this computer to imprve the 'snappiness/speed' of daily internet use etc.. (aside form ssd whcih im not going to do)