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CPU to RAM ratio???

post #1 of 16
Thread Starter 
When setting my clocks, my cpuz states I have a ratio of 4/6... I've tried lowering my memory to 225Mhz, but it seems to run slower. I have read a lot about having a higher memory ration than the cpu being better. Opinions on whether this is true?

and second: Is there a particular setting I should stick with on my D 920?

Currently set at 1120/860... Thanks all!
    
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post #2 of 16
your RAM can only use data as fast as it can be fed data by the processor.
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post #3 of 16
With an nForce + Intel, the system will be running at different ratios than you've seen before. I know that the RAM shows at 133mhz for DDR2 533, 166mhz for DDR2 667 and 200mhz for DDR2 800 so watch out when you change the timings because they're never shown correctly under CPU-Z.

So a 1:1 ratio will be 200:100. I couldn't tell you next because I have not paid any more attention to an nForce MoBo, nor I ever will.
post #4 of 16
Thread Starter 
Hmmm, so you're saying cpuz may be interpreting wrong, or the motherboard/bios is interpreting incorrectly? Sorry, confusing, I got married. Nothing makes sense. j/k
    
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post #5 of 16
The benefit of having a higher Mem clock is so that you can keep a 1:1 ratio and lowerest possible timings. For instance take my situation a while back when I was in the market for good ocing RAM.
I needed DDR400 but was shopping for DDR500. The reason for this was so that I had head room for OCing. At stock everything is at 200Mhz but keep in mind that my RAM could go up to 250 before ever having to tweak it at all. When my OC hits 250Mhz FSB then I am running at a 1:1 ratio. IMO 1:1 is the best as it is like your rig is running full steam on all cylinders.
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post #6 of 16
Thread Starter 
so if I'm running 4:6, is it hindering my performance at all? with a cpu clokc of 280, my mem is currently running at 430... I have no idea how to change my dividers, and my timings are at 4-3-3-4-6 (stock rating for my mem is 4-4-4-12-15)
    
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post #7 of 16
If your RAM is running faster than your CPU then there is no real gain. But if your CPU is running higher than your RAM then you will see the performance of your CPU's OC not RAM. Your RAM in this case is underclocked then increased using the FSB.

Lets say that your CPU can safely reach 250FSB and be stable without anything added no fans or voltage. Your RAM on the otherhand can only go up to 215Mhz FSB before it becomes unstable. So now what you need to do is go set your default RAM clock from (in my case) 200 to 166, this will allow me an extra 36Mhz of head room on my RAM. That 36Mhz + the 15 the rig was already OCed will allow my PC to clock up to 251 and remain stable. Your CPU clock will be 251Mhz FSB and your RAM would be at its max speen of 215Mhz due to the underclocking in the first place. Onbiously it would be better to have both you CPU and RAM running at 250Mhz so this is were a high RAM ratio comes in.

If your Ram is stock at 250Mhz and your CPU is stock at 200 but can safely reach 250Mhz FSB and remain stable then you can OC to 250 before having to do any tweaking. Even though the RAM runs at 250 the MB clocks it down to 200 by default so it is already underclocked, this is why it can go to 250 before playing with timmings and voltages. But since the MB underclocks it to default speeds there is no real gain in the higher RAM ratio speed.
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post #8 of 16
Thread Starter 
Okay, that helps. Let me get this right... Let's say I'm running 280 cpu, and 430 ram, I can clock down my ram to lets say 280(560Mhz rating) and my oc will be more stable. Wow, I guess I need to read up some more on this to understand it a little better. Thanks for the help guys... +1rep for the equation master, thanks a lot.

Setting my ram at 560 and my fsb at 1120 will actually run. Dumb question, but I'm still on the confusing side of the fence...
    
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post #9 of 16
Ok if your CPU is at 280Mhz is that stock? Also what is your RAM speed in the BIOS. My PC3200 shows up as 200 so its ddr400. I will Edit this post after you answer.

Your BIOS is most like very similar to mine being an Asus, is it American Megatrends?
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post #10 of 16
Thread Starter 
phoenix bios
200 for cpu stock
233 for ram stock, well its the xms 2 5400 675 mhz, so I guess 237.5
    
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