| DDR2 is the Next DRAM Architecture supports twice the bandwidth without increasing demands on DRAM core or pushing up power consumption. Voltage requirements for DDR2 (1.8v) are greatly reduced from that of DDR (2.5v). Down to 1.8 volts; this translates into a lot less power needed to read and write for the memory. Prefetch: DDR uses a 2-bit prefetch while DDR2 now uses a 4-bit prefetch Compatibility: DDR2 memory is only suitable for new motherboards with support for DDR2 memory. Do not attempt to use DDR2 memory in motherboards supporting ordinary DDR RAM | 
