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Multiplier vs. Bus Speed

post #1 of 11
Thread Starter 
So after doing some experimenting trying to get stable 4.9GHz going (My starting point was 48x100) I noticed something.. interesting.

First I tried 49x100, get some BSODs etc trying to get IBT to run 10 passes on High, then I thought of trying 48x102.1 instead.
To my suprise, I got 2-3 more succesful IBT runs with exact same volts etc by increasing the Bus Speed instead of the Multiplier.

Now I'm back to my 4.8GHz trying out if I could get less volts with 47x102.1.
My settings have been 48x100 and 1.35V for a while now, hoping that just MAYBE I could drop it down a notch or two with the Bus Speed 4.8GHz.

I also noticed that using Bus Speed gives less temps than using Multiplier does aswell, about 4-5C less max temps on IBT compared to just using the Multiplier.
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post #2 of 11
Interesting, keep us posted! I think I'll have to try that as well, though I have a fair bit more optimizing to do with my OCs first.
post #3 of 11
Thread Starter 
Ok so after last posting here I started using this and can hereby report that I have succesfully gotten rid of the idle BSODs with the settings posted above.
VCore has been 1.36V for all this time, before with the 48x100 setting I couldn't get rid of the idle BSODs even with VCore upto 1.375V.

So if you are having idle BSODs or other stability issues, I would suggest lowering your multiplier and increasing bus speed to get the desired speeds and see what happens, I definitely have had a very good result with this.
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post #4 of 11
Thread Starter 
Old thread but still having same results.

Running 5.2GHz I even get BIOS freezes with 52x100, but running 50x104 gives no issues at all.

Same goes for my current stable 24/7 clocks at 5GHz, running 49x102.1 instead of 50x100.
50x100 crashes in 4-5 IBT tests where as 49x102.1 has been stable for past few weeks without any issues on Prime and IBT.

Anyone else had a shot at trying things out this way?
Edited by Stige - 12/26/12 at 8:30am
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post #5 of 11
So at 5.2ghz (52x100) do you get into windows and stress test then get BSOD?
post #6 of 11
Thread Starter 
Quote:
Originally Posted by $ilent View Post

So at 5.2ghz (52x100) do you get into windows and stress test then get BSOD?

Don't think I actually ever even tried to get into Windows with 52x100 with the earlier discovery of using some BCLK being much more stable for me atleast.

When I set the multiplier to 52 it took some serious trying to get it out of it again before the BIOS froze lol.
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post #7 of 11
so what's stopping you from lowering the multiplier to say 10 and setting the bus speed to 520MHz? just wondering as i am doing a similar thing atm (on a much worse cpu biggrin.gif)
post #8 of 11
Quote:
Originally Posted by Jacksonator36 View Post

so what's stopping you from lowering the multiplier to say 10 and setting the bus speed to 520MHz? just wondering as i am doing a similar thing atm (on a much worse cpu biggrin.gif)
SB chips generally don't have more than 5% wiggle room on the BCLK. If you could get bus speed up to 110 it'd be impressive.
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by Vonnis View Post

SB chips generally don't have more than 5% wiggle room on the BCLK. If you could get bus speed up to 110 it'd be impressive.

Pretty much this yeah, getting it even 105MHz+ is achievement in itself already, 108MHz is propably near the max already.
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post #10 of 11
I have my 4820k running a bclk of 116 with a 36 multiplier for the end total of 4.568ghz with my ram being downclock to 1333 I uped the bclk till I hit 1600fsb on ram then uped the multiplier till it crashed. I just set the voltage to 1.39 and start playing. I haven't found a happy medium, I also notice the higher the bclk the lower your pci e bus speed is I was always told that needs to be 100 or 101 MHz I see 94mhz with a higher bclk.
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