Overclock.net › Forums › Components › Memory › Please, ratio help, explain
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Ok Im not completely new to oc'ing, but i just dont get this whole ratio concept.

I keep hearing that a 1:1 ratio is the fastest, My fsb is running at 266.7 x 9 = 1066mhz, My 4 gb ddr2 pc 6400 ocz ram is running at 363 mhz with 4-4-4-15 2T( only 363 because i had to downclock because of mobo issues with 4gb ram), I checked cpu-z and it says its running in a 11:15 ratio, and im assuming that thats not very good. Why is it running at this ratio?? How do i get it to run at 1:1 ratio?

Heres a pic of cpu-z

http://img143.imageshack.us/img143/3739/dsdszj5.jpg

Also, I am going to oc my ram too around 860 ( because it wont run stable on my mobo, between 730 and 860) If i overclocked to over 860 how could i get a 1:1 ratio???

If you want 1:1 ratio with DDR2 860, you will have to run your FSB at 430MHz.

example:
DDR2 800 is 400MHz, so 400 x 2= 800
DDR2 1066 is 533MHz so 533 FSB x 2= 1066
etc..
 My System (15 items)
 My System (15 items)
Ok thanks that helped out alot, But if i oc my ram too 860 or around there what would my ratio be if i didnt oc my cpu?
Quote:
 Originally Posted by ericeod If you want 1:1 ratio with DDR2 860, you will have to run your FSB at 430MHz. example: DDR2 800 is 400MHz, so 400 x 2= 800 DDR2 1066 is 533MHz so 533 FSB x 2= 1066 etc..
SO your saying i would have to change my fsb to 430 and change my multiplyer to 6?? that would equal 2.5 ghz. Because i dont really want to oc to 3.0ghz or more. I dont mind ocing my processor, but is that right?? Because 430 x 2 = 860
And 430 x 6 = around 2.5/2.6 ghz? so that would be 1:1 ratio because my fsb is half my memory speed?

If that is so will i see a increase in performance with the 430fsb instead of the 266 fsb, And will i see a difference with the 1:1 ratio, instead of the 11:15 ratio? Would i have to up the volts for my cpu higher than the 1.3v that its at now??

Quote:
 Originally Posted by RedFox911 SO your saying i would have to change my fsb to 430 and change my multiplyer to 6?? that would equal 2.5 ghz. Because i dont really want to oc to 3.0ghz or more. I dont mind ocing my processor, but is that right?? Because 430 x 2 = 860 And 430 x 6 = around 2.5/2.6 ghz? so that would be 1:1 ratio because my fsb is half my memory speed? If that is so will i see a increase in performance with the 430fsb instead of the 266 fsb, And will i see a difference with the 1:1 ratio, instead of the 11:15 ratio? Would i have to up the volts for my cpu higher than the 1.3v that its at now?? Im sorry,i guess you could say im an eager learner. Please help
The FSB is the system speed. It is associated with the CPU and ram becasue they too are based off the core speed of the system. But yes, a faster FSB will increase your performance. When OCing, you have to find a balance between performance and speed. This means that you sometimes have to lower your multi to keep the ram and system (based on the FSB) higher. I think 430 FSB would be too high, but you can run 400 FSB and x8 multi with 1.35v vcore (hopefully). You will also need 1.4v to the northbridge. Then you can run your ram at DDR2 800 with tighter timings, like 4-4-4-12.
 My System (15 items)
 My System (15 items)
Thanks man, that cleared up alot.

Well yesterday i oc'd my ram 866, @ 2.1v and tighten'd my timings too 4-4-4-15, I didnt really want to oc alot i just wanted them to finally work. I also think my nb is currently at 1.56, or already 1.4v i might be mistaken though. Hmm if it runs at 3.2 ghz ill be happy.

Thank you
Quote:
 Originally Posted by RedFox911 Thanks man, that cleared up alot. Well yesterday i oc'd my ram 866, @ 2.1v and tighten'd my timings too 4-4-4-15, I didnt really want to oc alot i just wanted them to finally work. I also think my nb is currently at 1.56, or already 1.4v i might be mistaken though. Hmm if it runs at 3.2 ghz ill be happy. Thank you
1.56v to the NB is dangerous. NVIDIA recommends not going above 1.5v. The default voltage on the NB is 1.2v. Try 1.4v and see if it is stable.
 My System (15 items)
 My System (15 items)
Quote:
 Originally Posted by ericeod 1.56v to the NB is dangerous. NVIDIA recommends not going above 1.5v. The default voltage on the NB is 1.2v. Try 1.4v and see if it is stable.
Ok ya i checked and i did have it set to 1.56, The only reason i did that is because that someone told me that i should have at least, 1.56v on nb if i have 4x1gb sticks, and there oc'd a bit.

I set it back too 1.4v and it seems stable. Is there any real way to check to see if the nb is stable. ?
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