Would this be compatible with my system?
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Corsair 1GB DDR XMS3200C2 Pro TwinX (2x512MB) CAS2 (MY-026-CS)
A matched pair of 512MB XMS3200C2 Pro memory modules - 1GB total - ideal for dual DDR motherboards.
Featuring an efficient aluminum heatsink to dissipate heat and built in LEDs to show realtime memory activity.
get this stuff http://www.newegg.com/Product/Product.asp?Item=N82E16820218062
remove the old stuff and put these in, if they run at 200mhz (also known as ddr400 or pc3200) than just throw the old stuff away. if they still run at 133mhz (pc 2700) than put old stuff in and see if it will run in dual channel, if it does leave it in, if it doesn't throw it away anyway.