PC133: The last SDRAM standard
PC 133 a SDRAM type of memory was the latest memory of that type. Earlier the market was widely flooded with DRAM types of memory. The DRAM memory sine work on asynchronous principal therefore was faster when seen in conjunction with the SDRAM memory. Owing to synchronous working in SDRAM execution of instruction or command executes with the clock signal. Further, the SDRAM was designed to allow queuing of instruction which means it accepts the instruction even though the execution of the earlier commands or instruction in progress.
This concept also introduced delay called latency in more common term. However, capability of SDRAM memory to exploit multiple memory banks though interleaving operation enables it to offer better bandwidth of data transfer rate. The SDRAM specifications were put forward by JEDED in the year of 1993 and since then till almost whole one decade SDRAM memory ruled the market. The SDRAM memories subsequently were slowly faced out of market by its newer version of DDR memory type. The DDR memories are capable of delivering double the peak data transfer rate compared to SDRAM memory as it pumps in data both at leading and trailing clock signal edge.
This is called data pumping concept. PC133 memory modules were designed with backward compatibility and thus were backward compatible with PC 100 type modules. PC133 basically operates at 133MHz clock signal frequency and uses 64bit wide data bus and are capable of delivering bandwidth of 1064 MB/s. PC 133 modules were available in both DIMM and SO DIMM packages.
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