16) Memory Ram DDR, DDR2, DDR3, DDR4.

16) Memory Ram DDR, DDR2, DDR3, DDR4.
- DDR: Double Data Rate, means memory of double data transfer rate in Spanish. They are modules composed by synchronous memories (SDRAM), available in DIMM encapsulation, which allows the transfer of data through two different channels simultaneously in the same clock cycle. DDRs support a maximum capacity of 1 GB.
-DDR2: It is the evolution of the DDR-SDRAM memory, from which it differs by operating at a higher clock speed (up to 400MHz), needing a lower voltage (only 1.8V instead of 2.5V) and having greater latencies. They are mounted on 240-contact DIMM modules.
-DDR3: It is the evolution of the DDR2 memory, and as in the previous case, these memories have a higher clock speed (from 400 to 1066 MHz), lower voltage (we go to 1.5 V) and higher latencies. They are mounted on 240-contact DIMM modules, just like DDR2 memory, however, they are not compatible because they work at different speeds and voltages.