why times 8?

G

Guest

Guest
There is pc133 SDRAM and DDR RAM pc2100, you get pc2100 multiplying 133 times 2 and times 8 and that will gave you pc2100. I understand that DDR means Double and you should multiply times 2, but WHY SHOULD MULTIPLY BY 8 AFTER THAT???
 

wapaaga

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Jan 18, 2001
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the 2100 hunder stands for how much data it can move persecond

2100 is 2.1 gb/per second

it switch when they went for sdram to ddram

<font color=red>Gasoline + Fire</font color=red> Can be a lot of fun :smile: :smile: :smile:
 
G

Guest

Guest
There are 64 addressable bits per clock cycle with DRAM.
There are 8 bits in a byte.
So if you divide 64bits by 8 you get 8bytes
So there are 8 bytes per clock cycle with DRAM.
Plus DDR DRAM has the double data rate like you said.

So to find the bandwidth of the DDR Ram in MegaBytes/Second you take:
Frequency in Mhz * Number of bytes per cycle * 2 for DDR=
133*8*2= 2100 MB/s

TaDa!

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