some of you guys are way off, in the motherboard, the ram will run the speed you set it at in the motherboard, and if you automatically do it, most of the time it runs at the speed that the ram in the first ram slot is set at. Now, you dont want to mix ram types if you can help it, and there is little need for more ram than 512MB total, so id go with the 2700,
www.newegg.com for the best prices
-i build computers for a living, just pm me if you have any questions.