What is PC400 RAM? Why won't it work in my Dell?

Question

DDR 128x4 PC400 1G AUM1807 is the sticker on the RAM. My computer is a Dell Optipex GX270. Got any ideas? Thanks!

Answer 1

PC400 is another term for ddr400 or PC3200. Try each stick one at a time on the slot closest to the processor. If not a single one works, it might be the buffered type and not compatible w/ your motherboard.
Here are the upgrade specs for your PC:
http://www.memorystock.com/memory/DellOptiplexGX270SFF.html