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Ram frequency vs fsb:ratio

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  • Memory
  • Corsair Dominator
Last response: in Memory
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November 16, 2010 6:21:03 PM

Hello,

I have done a fair amount of reading regarding this topic, as soon as I think I understand something, I see contradicting data that throws it all out of the window.

So I'm rocking a Q6700 stock 2.66 oc'd to 3.75ghz. I think I have some 4gb (2x2gb) corsair Dominator 8500 1066mhz.

I'm currently running at fsb: dram 1:1 (375mhz).

Is this in any way optimal ratio? Would overclocking the memory have positive impact? Back in the day I remember some golden rule to 1:1 ratio but is that ancient now?

any assistance would help? :hello: 



P.S. on a side note, I play ALOT of games :)  so gaming environment answers would be optimal... Thanks :bounce: 


EDIT: in order to fully utilize this 1066mhz, Do I need to have my frequency up from 375 to 533?

More about : ram frequency fsb ratio

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a b } Memory
November 16, 2010 6:38:57 PM

It really does not matter. 1:1 ensures stability but if you run other ratios, no matter.

If your CPU FSB is 375, running a 1:1 ratio, that will set your RAM to 375 (750 rated). There is nothing wrong with that setting as you'll not see a difference if you were running your RAM @ 533 (1066 rated)

There is no way you will be able to bring the FSB of that CPU to 533 so don't even try it, the highest you'll get is likely 425-ish but there's no point.

Since your RAM is technically underclocked when using the 1:1 ratio, you might try to bring yout timings from 5-5-5-15 to 4-4-4-12 or something, this will yield a slight improvement if successful.
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November 16, 2010 6:42:13 PM

Best answer selected by jonnyrb.
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November 16, 2010 6:42:30 PM

jonpaul37 said:
It really does not matter. 1:1 ensures stability but if you run other ratios, no matter.

If your CPU FSB is 375, running a 1:1 ratio, that will set your RAM to 375 (750 rated). There is nothing wrong with that setting as you'll not see a difference if you were running your RAM @ 533 (1066 rated)

There is no way you will be able to bring the FSB of that CPU to 533 so don't even try it, the highest you'll get is likely 425-ish but there's no point.

Since your RAM is technically underclocked when using the 1:1 ratio, you might try to bring yout timings from 5-5-5-15 to 4-4-4-12 or something, this will yield a slight improvement if successful.

Thanks for a stellar answer :) 
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a b } Memory
November 16, 2010 6:48:16 PM

Welcome, i had a Q6600 OC'd to 3.6 running a 400 FSB and it worked right on par with my DDR2-800 rated (400MHz) RAM. Since i was running my RAM at it's default speeds i was able to tighten the timings from 5-5-5-15 to 4-4-4-12.
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a b } Memory
November 17, 2010 5:23:57 AM

This topic has been closed by Maziar
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