- Nov 21, 2010
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Is there some formula for knowing that DDR4-2666 is PC4-21300 or is it just something you memorize?
Yes there's a formula.
System memory in Desktops and Laptops are 64-bits wide. 2666 in DDR4-2666 refers to the transfer speed in MegaTransfers/s(MT/s).
2666 MT/s x 64 bits x 8 bits/byte = 21,328MB/s or 21.3GB/s. That's how you get PC4-21300.
Shouldn't it be (2666x64)/8... ?