Still lemme answer your query:
First calculate the bandwidth of you RAM
You just take the the speed the RAM is clocked at, double it then multiply by 8. And if you're running dual channel mode, you double it again.
Quote:
DDR-200: DDR-SDRAM memory chips specified to operate at 100 MHz
DDR-266: DDR-SDRAM memory chips specified to operate at 133 MHz
DDR-333: DDR-SDRAM memory chips specified to operate at 166 MHz
DDR-400: DDR-SDRAM memory chips specified to operate at 200 MHz
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Bandwidth basically means how much data [1 & 0s'] can be crammed in simultaneously by you OS. Greater the bandwidth better the performance [less chances of hanging/lagging]
But on the filp you will run out of memory sooner due to the smaller capacity.
[Think of this as a pipline and a tank, no use of a bigger pipe if the tank is full.]
If you:
> do video editing or use any other resource heavy application [3d editing, cad, simulators] in which a little "lag" is tolerable, go for greater ammount of memory.
>for performance, gamming and future upgradibility's sake go for greater bandwidth.