ddr3 ddr2 ddr1 常見參數

ddr: 頻寬(ex:pc-1600) = data rate(ex:200MT/s) * 8
       data rate = io bus frequency(100MHz) * 2
       io bus frequency = memory frequency

ddr2: 頻寬(ex:pc2-6400) = data rate(ex:800MT/s) * 8
       data rate = io bus frequency(400MHz) * 2
       io bus frequency = memory frequency (200MHz) * 2

ddr3: 頻寬(ex:pc3-12800) = data rate(ex:1600MT/s) * 8
       data rate = io bus frequency(800MHz) * 2
       io bus frequency = memory frequency(200MHz)   * 4

ddr3-1600: 1600指的是data rate

同樣的時脈 , 頻寬更高.