So I am a complete grade A moron when it comes to computers. Hopefully someone will indulge my ignorance. Don't know if any of this matters. Have a Dell with Intel P4 3.00 w/ 800 mhz FSB. Installed 2 GB RAM. Memory Speed = 533 mhz. Dual Asymmetric DDR2 SDRAM Dimm 1 512mb Dimm 3 1GB Dimm 2 512mb Dimm 4 empty. Here is my question. My platform has been hogging memory big time lately and want to upgrade to 4 gigs and get it over with. But want to do it right. Saw a Samsung 2 GB 667 mhz. http://www.memorysuppliers.com/sa2gbdd66pcc.html Will this work? Or is the 667mhz unnecessary or incompatible? Should I find a 533mhz? And when I install the new memory, should I switch them around and take advantage of one? Or does it matter? Thanks in advance for any help. Obviously haven't a clue what I am doing, but would like to get as much bang as I can.