Originally posted by Sephiroth@Dec 16 2002, 08:04 PM
The difference between DDR2100 and DDR2700 memory is higher bandwidth. DDR2700 is faster than DDR2100, and the higher the bandwidth the memory bus has, the faster it can process and page information in and out of memory. In other words, DDR2700 will be faster than DDR2100, but by how much, I don't know, b/c I've never compared the two.
To carry on further on Sephiroth's reply, here is how bandwidth is calculated:
Each DIMM module (SDRAM of DDRAM) is 8 Bytes wide. So basically each module is capable of 64-bit addressing (1 Byte = 8 Bits).
Peak Bandwidth = (Memory Bus Width) x (Memory Bus Speed) x (Operations/Clock Cycle) .
So taking the above into consideration,
PC2100 bandwidth = (8 Bytes) * (133 MHz Memory Bus Speed) x (2 Operations per cycle) = 2,128 MB/sec = 2.1 GB/sec bandwidth rate
PC2700 bandwidth = (8 Bytes) * (166 MHz Memory Bus Speed) x (2 Operations per cycle) = 2,664 MB/sec = 2.7 GB/sec bandwidth rate
Hope the above explains bandwidth calculation!
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