RAM usually have 3 types: DDR 1, 2, and 3. DDR1 RAM is usually clocked from 266MHz to 400MHz; while the DDR2 and DDR3 (the last one) are often impulse now from 400-800 MHz and 800 MHz from - 1.6 GHz. Price between DDR1, DDR2 and DDR3 differ greatly. Such as the Corsair 2GB DDR3 RAM (includes 2 bars, each bar 1 GB) costs $ 90, it is also the type of RAM is DDR2 Corsair 4GB but only 69USD.
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