C.R. Ram (Random Access Memory) (What?)

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Ram is commonly referred to as memory. Memory is measured in megabytes, abbreviated MB. Ram is used by the computer as a temporary storage area for the things it is using. The more ram you have, the faster the computer can perform tasks. 

C.R.1. SD RAM (Synchronized Dynamic RAM)

SD RAM is manufactured as 148 pin dims. Synchronized means that it is synchronized to interact with the CPU at specific intervals. This means that it doesn’t have to wait for the CPU to be ready since it has time scheduled to communicate with the CPU. Basically, SD RAM is just faster. 

C.R.2. DDR (Double Data Rate) SD RAM

DDR attempts to theoretically double performance of the SD RAM memory system by applying double data rate technology to send data on each edge of the clock signal in theory, doubling the data output of a device while not increasing its clock frequency in MHz .

 C.R.3. RD RAM (Rambus Dynamic Ram)

RD RAM architecture takes a different approach from SD RAM. Narrow high-speed buses are used. RD RAM transfers data at up to 800 MHz .