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There are only two types of system memory we are going to cover here DDR and Rambus , There are others 72pin-Simms and SDram but they are to old to use , So we will stick to DDR and Rambus.
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DDR is used more then any other type of memory because it is cheap and fast, It can be used with AMD or Intel and even Viacyrix motherboards , It comes in three speeds PC2100 at 266MHz and PC2700 at 333MHz and even the new PC3200 at 400MHz , And it comes in five sizes 64MB , 128MB , 256MB , 512MB and 1Gb. The best thing about DDR is that it can be used as a sigle stick , For example if you are going to run a ( cpu ) or processer P4-2.4GHz at 533MHz-fsb and would like 512MB of memory , You can buy one stick of PC2700-333MHz 512MB , You don,t need two sticks of 256MB , I have 1GB of PC3200 in main. The only time you would use DDR in pairs is if you are going to use P4-cpu at 800MHz-fsb , Then you will need two sticks of DDR PC3200 at 400MHz at 256MB to get 512MB, put one stick in channel-A slot-0 and the other in channel-B slot-2 this is call dual channeling and it is the best way to run P4 at 800MHz .
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Rambus is not cheap but fast and is a Intel only memory type , I say that because there is no AMD or Viacyrix motherboards that uses Rambus memory out there that I know of. And un like DDR you must use it in pairs , And if you have four memory slots 0 through 4 and only going to use two of them 0 and 1, Then you will need to put the blanks that come with your motherboard in 3 and 4 , Rambus comes in to speeds of 800MHz for 400MHz-fsb P4-cpus and 1066MHz for 533MHz-fsb P4-cpus, And comes in four sizes 64MB , 128MB , 256MB and 512MB .
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