OC - Memory keeps running 1:1

[pokekil]

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[ViRGE]

DDR2 is double-pumped, that is it transmits twice per clock cycle. So DDR2 800 actually runs at 400mhz as a result, which is correct for your setup.

 

[pokekil]

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[pokekil]

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[JustaGeek]

Thats right - memory bus at 1:1 at 400MHz = 800MHz DDR2 Ram speed.

 

[pokekil]

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[SilentAssassin]

Like someone already said the ram is twice the speed of what it actually runs at. The ram does this already that's not what the 2:1 ratio setting does in the bios. You want to use the 1:1 ratio when running a 400mhz fsb and using DDR2 800 ram. 2:1 would be an actual 800mhz clock on the ram which I don't even think can be done so good thing the ram didn't actually try to run that or you might of killed it.

 

[JustaGeek]

Originally posted by: pokekil
oh i get it
because the e6x50's are 1333fsbs
it would be impossible for me to oc these on my current ram.
correct?

1333MHz is a "Quad Pumped" FSB of 333MHz.

If your FSB clock is set to 400MHz, it will give you 1600MHz "Quad Pumped FSB"

(It is confusing, because quad pumped or not, it is still called the FSB).

But your CPU multiplier works with the "base" FSB, hence 400MHz x 8 = 3.2GHz.

And your DDR2 (Double Data Rate 2nd generation) memory works with "base" FSB of 400MHz x 2 = 800MHz.

Your CPU multiplier = 8.

Your DDR2 RAM multiplier = 2.