higher fsb or multiplier?

theMan

Diamond Member
Mar 17, 2005
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ok, i havent seen a definite opinion about this, but does anyone know if it is better you use your highest possible fsb or highest multiplier? i have tried both. i didnt notice much, but i didnt look very hard. thanks.
 

CheesePoofs

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Dec 5, 2004
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Doesn't matter, what matters is which one will allow you to use the ram frequency closest to your ram's limit.
 

theMan

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Mar 17, 2005
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does a ram divider reduce performance? if i am running my fsb at 280, and my ram can only go to 230, lets say, can i treat my latency settings like it is running at 230? is that just the same as fsb 230, ram 1:1?
 

superkdogg

Senior member
Jul 9, 2004
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Originally posted by: theman
does a ram divider reduce performance? if i am running my fsb at 280, and my ram can only go to 230, lets say, can i treat my latency settings like it is running at 230? is that just the same as fsb 230, ram 1:1?

If your ram is running 230 MHz, then yes. The ram doesn't know what speed the CPU is running or anything else-it just goes the speed you tell it to.
 

theMan

Diamond Member
Mar 17, 2005
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yeah, thats what i thought, but there are all these people that say if u cant run @ 1:1, you should get better ram. i dont know where that comes from. thanks a lot.
 

3chordcharlie

Diamond Member
Mar 30, 2004
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Originally posted by: theman
yeah, thats what i thought, but there are all these people that say if u cant run @ 1:1, you should get better ram. i dont know where that comes from. thanks a lot.

those people are coming from AXP or P4 systems, which do not like memory dividers (at least in terms of performance).
 

TStep

Platinum Member
Feb 16, 2003
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On A64, I always aim for the highest clock speed first. Then manipulate the LDT, multi, and memory dividers to max out the memory (either lower speed/tight or higher speed/loose, determined after testing).

AXP - same as above, but leave the memory dividers at 1:1 and aim for the tightest timings.

P4 - no choice but to maximize the fsb to the cpus max, then select memory that suit your cpus max fsb either via 1:1 loose or 5:4 tight. That is for 865/875 dual channel setups obviously.

I will never sacrifice very much clockspeed for memory speed.
 

perdomot

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Dec 7, 2004
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What if the higher fsb leads to lower overall speed? I can run at either 9 X 270 or 8 X 290(2430 VS 2320) but which one would have better real world results?
 

lycurgus

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Jun 23, 2002
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I would go with the highest FSB that can still allow you to run synchronously with the RAM, then up the multiplier from there to max out the CPU clock speed.
 

theMan

Diamond Member
Mar 17, 2005
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well, what im saying is, if the memory speed is the same, and the cpu speed is the same, is there a differnce between a really high fsb and a maxed put multi? if everything is the same?