Overclocking the Front Side Bus.

Overclocking via multiplier is a fairly easy affair. Using the front side bus I have dabbled with before, but I am not completely familiar with it. I would like to be, though. I have looked elsewhere for guides and information, but I have yet to run across something comprehensive and definitive. In this thread I hope that we can hash out all the nuances of FSB overclocking.

In my own case, I am not entirely sure of which voltages to tweek to ensure and enable stability. Additionally, CPU/NB and HT Link frequencies I'm never quite sure of what to do with them; in my dabblings I have been trying to keep them around stock.
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  1. What processor are you using? Motherboard? RAM? Cooling? All of these are important to figure out a good, decent overclock for you.

    I'm running an FX-8320 @ 4.8Ghz/1.38v on water with a Sabertooth 990FX Rev1 mobo. I got there by upping the multiplier to 23 and bumping the FSB to 210 just for a little added performance over straight multiplier OCing. NB is at 2300mhz and HT is at 2600mhz, haven't touched any voltages other than CPU vcore.
  2. FX-4170 in an Asus M5A97 EVO, with G.Skill RipjawsX 1600 RAM, and an Enermax ETS-T40-TB.

    Currently, I am running at 4.6ghz with a Vcore of 1.404; the CPU Core temperature is around 50C. (Roughly 70F/21C in the room.) This is with multiplier-only overclocking. I have achieved the same with FSB overclocking (leaving the multiplier at the stock 21, but then upping the FSB to 220).

    With multiplier overclocking, I have managed to get up to 4.9 ghz, but the amount of voltage needed to even be able to boot properly was more than what I would like to pump into my processor, and the heat during a prime95 stress test was too much for my cooling solution. However, I understand what I precisely need to do to achieve that. With FSB overclocking, there is a lot more to worry about, and I am not exactly sure what is needed beyond more Vcore, or the various frequencies.
  3. Ah I see. Yeah, I don't know much about FSB OCing beyond that it offers a slight performance bump compared to straight multi OCing. I could only bump mine up 10mhz before I started getting memory errors, but I got a set of G.skill Ares 1866mhz RAM sitting on my front porch waiting for me to get home so we'll see if that changes anything.

    If were you I'd just go with straight FSB OCing since you can get to 4.6ghz on that alone--the performance will be a little better compared to 4.6ghz on multi alone.
  4. I am going to assume that, despite a general agreement that FSB seems to improve performance over multiplier-style overclocking, that the trouble to master it is not worth the effort.

  5. Best answer
    Yup--that seems to be the consensus. 4800mhz on multi gives me 45gflops in intel burn test whereas 4800mhz on FSB gives me it's not worth the extra tweaking in my opinion.
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