faisal

when to set timing of 1:1(amd)??
anybody please xplain

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KRookie

really sexy!

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Stalker

That chart confuses the crap out of me...can anyone do an example for me as simple as possible cuz I still don't understand where to use the multiplier and the fsb and the divider in the equation... what does the equation look like?

Does that mean that if I have my CPU multi on 12x, my FSB on 250, my mem divider set to 533mhz and my HT multi on 5x then I can run my CPU @ 3ghz, my memory on 667mhz and my and my HT freq on 1250mhz? Does this make sense at all?

The Duke

Having you memory at 333MHz of a DDR2 667 setting will give your RAM about 83% of the CPU clock speed. I say about because the CPU multiplier screws with actual speed.
So for every 100MHz the CPU is OCed, the RAM will only increase @ about 83MHz.

Do remember, the CPU speed effects the RAM and HT, but the HT has nothing to do with the RAM speed set in the BIOS. The HT speed is directly related to only the CPU.

Do check out CPU-Z and the "Memory" section. It will display the actual raw RAM speed so you do have to double it to see the DDR2 speed.

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durch

A couple months ago I wrote up some more details on the subject with examples. It's a longer read, but might benefit some of you still confused by the charts. DDR2 Memory Dividers Explanation with Examples

Stalker

THANK YOU!!! At last, I can see the light!

adramalech707

okay i am digging the chart just got done printing it out, but i have one problem....i am trying to get 3.0ghz on a x2 4600+...now do to the chart i am trying for a cpu multiple of 12 and a fsb of 250...

now after that part i don't think i got it right because by what durch said in his thread about dividers i am thinking that having my memory at ddr2-800 is possible at 3ghz, i took 3000/6 = 500x2 = 1000

now i think i misunderstood something along the line....should i put the divide at ddr2-667 instead??

also, i don't have my memory at the epp standard, i have it at the motherboard default settings, which is 5-5-5-18 2T@ 1.9volts or 2.1volts....but the epp settings for the memory is 4-4-4-12 2T @2.1volts

also i have increased the fsb and increased the vcore of the NB also increasing the cpu voltage to 1.5volts, but i am still getting a post error about the amount of mhz of the fsb...should i try and lower the ht from 5x to 4x to allow for a higher fsb???

llChaosll

Hey Adramalech, putting your ram frequency on 800 and putting your CPU Multi to 12 and HT to 250 will net you 3Ghz and your ram will be running at 1000 mhz. If you ram cant take the 1000 speed, simply reduce your ram frequency to 667 and your ram will be at 750mhz.
Try to find the highest your ram will go, then pick a multi that will work with both high ram frequency and cpu clock.
Hope that helps, always remember to change your HT Link Multi, you want to stay anywhere from 900-1100 HT.
To figure out your HT, simply multiply your HT Multi by your HT or as people would say FSB.
In your case if you use the above example then put your HT Multi to 4.
250X4 = 1000 HT.

GL!

SciaTica

So after reading this most informative post, what I have been able to glean from it is that:

If I want my memory to be OC'd to higher speeds, I should overclock my CPU using the Frequency rather than the Multiplier, therefore increasing my memory speed along with CPU rather than just the CPU.

AND

If my Frequency is set so high that it causes my memory to become unstable, I reduce the memory divider to re-stabilize it, kind of like the HT multiplier?

Thanks, SciaTica

WBaS

Yep pretty much. Increasing your reference clock will increase both your cpu and memory. If you want to change your ram frequency you can either do it by changing your reference clock or divider.

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