whats faster....
If your motherboard requires DDR2 RAM, the DDR3 RAM won't work and the DDR2 RAM is faster. If your motherboard requires DDR3 RAM, the DDR2 RAM won't work and the DDR3 RAM is faster.
Ram capacity means just that, how much stuff it can have in it at once and has nothing to do with speed unless it's full. Higher speed means the RAM works faster, but you probably won't notice a difference unless you're a serious gamer.
If they both have the same processors and everything else is similar, you should either go with the 2gb DDR2 RAM or add another 1GB DDR3 RAM to the other one. The operating system uses some RAM just keeping the computer running (the amount depends on which operating system) and capacity is more important than type or speed for most people.
Audrey: Who has one of those boards? That's right, nobody lol.
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