Nov 23 2006, 07:04 PM
QUOTE(mytescocom @ Nov 16 2006, 05:09 PM)
If you have a 1 x 512MB 533Mhz DDR2 RAM -your effective FSB is 533Mhz.
If you use 2 x 256MB 533 DDR2 RAM with dual channel, your effective FSB is 1066Mhz.
The total memory is the same for both cases, but just the difference with the FSB.
With dual channel, this allows you to achieve 1:1 ratio with your processor (assuming it's your CPU is Core2 Duo -1066Mhz)
I think you're using the wrong terminology. RAM frequency ≠ FSB. FSB is for processor. And dual/single channel doesn't change RAM frequency either. If you use 2 x 256MB 533 DDR2 RAM with dual channel, your effective FSB is 1066Mhz.
The total memory is the same for both cases, but just the difference with the FSB.
With dual channel, this allows you to achieve 1:1 ratio with your processor (assuming it's your CPU is Core2 Duo -1066Mhz)
To sum things up (all can be found on the 1st page):
Effective FSB = base FSB x 4 for Intel system OR base FSB x 2 for AMD system
Effective RAM frequency = base RAM frequency x 2 for DDR & DDR2 RAM
1:1 ratio is acheived by matching base FSB with base RAM frequency (no "effective" stuff, no multiplication). This is highly recommended for optimum performance, and is especially important for AMD systems because the AMD FSB is not very efficient when it is slower than the RAM.
[waiting for someone to correct me
]This post has been edited by yu_wang: Nov 23 2006, 09:35 PM
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