What does it mean (memory ratio)

[kingfetty]

Should be simple enough to answer.


What does the memory ration mean? 1:1, 1:2, etc.?

 

[BenchZowner]

It's the ratio ( let's say 'dependence' ) of the FSB Frequency with the RAM Frequency ( DDR-xxx rating ).
For example, if you're at 266MHz FSB and you're using the 1:1 FSB/DRAM Ratio ( Divider ) your RAM will be clocked at 533MHz.
With the 1:2 Ratio your RAM will be clocked at 1066.
Etc etc

 

[kingfetty]

So the second number is the RAM speed and the first is the CPU FSB?

So...

266 FSB @ 1:1 = 266 RAM (ddr2 533)?
266 FSB @ 1:2 = 522 RAM (ddr2 1066)?

 

[BenchZowner]

It's a ratio.

if you divide them the opposite way ( 1:2 div -> 2/1, 4:5 div -> 5/4 ) and then multiply the result by FSB you'll get the RAM Frequency.

Example:
With an FSB Frequency of 333MHz, the:
1:2 Ratio will clock your RAM at DDR-1333 ( because: ( 2/1 ) * 333 * 2 = 1333 )
4:5 Ratio will clock your RAM at DDR-832 ( because: (5/4) * 333 * 2 = 832 )
etc

 

[dealmaster00]

I wonder why people always misspell ratio. I do it all the time. Maybe its because we are used to ending words in "tion" and ra"tio" is 3/4 of the way there.