I am looking to upgrade to an Athlon 1.4GHz, and looking for a motherboard. I am trying to decide between getting a DDR board or a SDRAM board. I have two sticks of PC150 memory, and I rather not spend more money buying DDR even though they are cheap. So my question is, will I see a huge difference between using DDR vs. my PC150 SDRAM on a 1.4GHz Athlon system? Is it worth spending another $100 for 512mb of DDR for the increase in performance?