DDR2 RAM
Submitted by zenadm on Tue, 04/28/2009 - 15:39
Sekilas mengenai DDR 2 RAM
Perbedaan utama DDR 1 dan DDR 2 adalah bus ditingkatkan menjadi dua kali dari kecepatan memory cells, DDR2 secara efektif dapat beroperasi dua kali lebih cepat dari bus-nya DDR 1.
Frekuensi bus dari DDR 2 meningkat secara drastis, namun latency juga meningkat secara drastis sebagai gantinya. DDR 1 memiliki read latency antara 2 - 3 cycle, sedangkan DDR 2 memiliki read latency 4 - 6 cycle.
DDR 2 lebih hemat listrik, karena proses manufaktur yang menyebabkan penurunan pada voltase.
DDR 2 beroperasi pada 1.8 V sedangkan DDR 1 beroperasi pada 2.5 V. Menurut JEDEC, voltase maksimum yang boleh dicapai adalah 1.9 volts.
| Standard name | Memory clock | Cycle time | I/O Bus clock | Data transfers per second | Module name | Peak transfer rate |
| DDR2-400 | 100 MHz | 10 ns | 200 MHz | 400 Million | PC2-3200 | 3200 MB/s |
| DDR2-533 | 133 MHz | 7.5 ns | 266 MHz | 533 Million | PC2-4200
PC2-43001 |
4266 MB/s |
| DDR2-667 | 166 MHz | 6 ns | 333 MHz | 667 Million | PC2-5300
PC2-5400 |
5333 MB/s |
| DDR2-800 | 200 MHz | 5 ns | 400 MHz | 800 Million | PC2-6400 | 6400 MB/s |
| DDR2-1066 | 266 MHz | 3.75 ns | 533 MHz | 1066 Million | PC2-8500
PC2-8600 |
8533 MB/s |
| DDR2-1300 | 325 MHz | 3.1 ns | 650 MHz | 1300 Million | PC2-10400 | 10400 MB/s |
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