Try and help me understand a bit... CPU NR, and FSB for overclocking

So... I am trying to understand overclocking a little better. I have some very basic knowledge that i have put to good use, but I would like to know more, here is what I know about CPU overclocking.

Todays CPUs have unlocked CPU multipliers, so in order to increase the clock speed, you only have to change the multiplier in order to achieve a higher clock, where in the passed you had to use the FSB to do this.

When increasing the CPU frequency, you go up in steps, then enter windows and test stability. You keep going until things either fail the stress test, crash or won't post. Then you add the least amount of voltage you can until the CPU is stable. Kinda the same thing you do when overclocking a video card. Simple right?


Well... what do I do with the CPU NB, and the plain north bridge? WHen do I play with the FSB?
I have had some overclocks, lighter ones that just would not get stable, even with adding voltage, and i've always wondered if I should be playing with NB voltages. Do I ever need to touch this stuff if i'm just trying to clock up my CPU?

I know the FSB will increase ram and north bridge as well...

Is there any need to play with these settings with modern AMD cpus? What is the point? Can someone break down when to use the FSB for overclocks, and when to adjust the NB voltages and why?
Reply to glytch5
6 answers Last reply
More about understand bit cpu fsb overclocking
  1. Hi,
    You should Google for overclocking guides for your specific hardware as it varies a lot.

    It's actually quite detailed if you want to understand it well so it's really beyond a post like this.
    Reply to photonboy
  2. photonboy said:
    Hi,
    You should Google for overclocking guides for your specific hardware as it varies a lot.

    It's actually quite detailed if you want to understand it well so it's really beyond a post like this.


    I totally agree. There could be enough content to write a book to answer these questions.
    Reply to feelinfroggy777
  3. Thats the thing... I have read so many articles but every time I am done with one... I still feel like I have learned nothing. I can't seem to quite find the answer the i'm looking for.
    I just don't get when to use the north bridge and the bus... they all explain what they do, I can't figure out how to put those to use though, or if I should even care about them.

    I mean, what do you guys do to overclock? Do you guys mess wit the bus and NB?
    Reply to glytch5
  4. I only tweak the v-core and the frequency for the chip and run XMP for the memory. You can mess with the BCLK and it will effect your memory clocks as well, but the math starts to get a little funny when you move the multiplier off of 100.

    So for simplicity, I just slowly bump up the multiplier till it crashes. Then I add some to the v-core. I have a 7700k and I get 5.0ghz at 1.34 volts. 1.35 volts is about as high as I prefer to take it, but some will crank it all the way to 1.45.

    Then it just comes down to cooling. I like my temp averages to stay below 80C under load.

    There are millions of overclocking guides out there. Jayztwocents has a lot of good videos for overclocking and explains it fairly easy. So you can check out the video if you want.

    https://www.youtube.com/watch?v=Qcta3RStYSM
    Reply to feelinfroggy777
  5. okay lets say I just started boosting my clocks as you did, and use XMP like I also do. And i'm only a few hundred mhz over stock, and all the sudden I can't get stable even with a lot of added voltage...
    Aren't I supposed to go in there and play around with North bridge, or do some Bclock stuff before I give up?

    I remember a while back Linus has a video of overclocking is FX, and he was able to get stability out of mixing the overclock between FSB and just CPU multiplier.

    So from what you are saying, and what I originally thought is, now days people are for the most part just blasting up their CPU multiplier and voltage while leaving the rest of the stuff on auto?
    Reply to glytch5
  6. Also... if I did want to do most of the overclock with the FSB, should I turn back down the HT link speed within the stock range? And not let my ram go way out of stock range? Or just let it all fly? Its those NOrth bridge voltages and speeds, the HT link that really scares me. I'm always expecting to hear a loud pop inside my box while doing this haha. THanks for the info.
    Reply to glytch5
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