Different memory chips?
17 May 2002, 05:25 PM
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Double Data Rate (DDR) RAM also has three versions - PC1600 (2x 100 MHz), PC2100 (2x 133 MHz), & PC2600 (2x 166 MHz). DDR RAM gets those PC ratings from the theoretical amount of data they can move (their bandwidth). For instance, PC100 SD RAM has the ability to move 0.8 gigabytes per second (GB/sec). As DDR RAM can move information twice as fast as SD RAM because it reads on the rise and fall of the clock cycle, 200 MHz DDR (100 MHz doubled) is able to move 1.6 GB/sec. However, though DDR transfers data twice as fast as SD RAM, this doesn't mean your computer will run twice as fast. DDR RAM has a CAS value of 2.5 due to DDR RAM accessing the RAM on either end of the clock cycle.
RD RAM: Rambus RAM has three renditions - PC600, PC700 and PC800 on a 184 pin RIMM™ module. As mentioned earlier, RIMM™ is trademarked and they connect in a series circuit (thus needing a C-RIMM™ to complete the circuit if you are only using one module on your motherboard- a terminator really). RD RAM works just like DDR RAM in that they both transfer data on the rise and fall of the clock signal - however, where they differ is that RD RAM transfers less information more often in an effort to increase speed. As mentioned earlier though, the "series circuit" nature of RD RAM introduces latency as the signal needs to travel through all the RIMM™ modules before getting to the memory controller. Also a non-sequential access of Rambus memory requires 25 clock cycles before the next address can be read. Since applications have a tendency to frequently "branch" to different areas of RAM memory, any increases in bandwidth inherent in Rambus is lost due to its high initial access latency.
HTH
RD RAM: Rambus RAM has three renditions - PC600, PC700 and PC800 on a 184 pin RIMM™ module. As mentioned earlier, RIMM™ is trademarked and they connect in a series circuit (thus needing a C-RIMM™ to complete the circuit if you are only using one module on your motherboard- a terminator really). RD RAM works just like DDR RAM in that they both transfer data on the rise and fall of the clock signal - however, where they differ is that RD RAM transfers less information more often in an effort to increase speed. As mentioned earlier though, the "series circuit" nature of RD RAM introduces latency as the signal needs to travel through all the RIMM™ modules before getting to the memory controller. Also a non-sequential access of Rambus memory requires 25 clock cycles before the next address can be read. Since applications have a tendency to frequently "branch" to different areas of RAM memory, any increases in bandwidth inherent in Rambus is lost due to its high initial access latency.
HTH
17 May 2002, 05:37 PM
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I think therefore the answerto my next question will either be 'dont know' or 'no'
Can I put a DDR RAM chip into a machine that has RD RAM slots?
Can I put a DDR RAM chip into a machine that has RD RAM slots?
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