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FSB or NB?

post #1 of 9
Thread Starter 
So, this question has probably come up before but I am so noob at this, it just sucks. Okay, so as you can see in my sig, you see the equip that I have. Now when I overclock my CPU by increasing my FSB, sometimes I seem to hit a brick wall with the memory and FSB and it just wont boot because of the memory and I can't get the CPU up as high as others with the same equip, primarily because of the voltage and the heat. Anyways, is there a different way to overclock using for example the North Bridge or something? I have heard about it briefly but don't know what even the NB totally does. I notice that some people super cool their NB heatsinks but I don't know why you would overclock it. Any help/links is greatly appreciated!
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post #2 of 9
When you increase the Front Side Bus speed, you're overclocking the northbridge. The NB is what links your CPU with your memory.



For the NB to handle the higher FSB, you need to increase the Northbridge volts, kind of like when you increase the Vcore in your CPU to handle the higher clock speed.

For some CPUs, like the E8xxx penryns, you can reach higher FSBs without putting additional Vcore, but once you hit a wall, you need to start increasing your CPU's voltage gradually to get it stable.
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post #3 of 9
Thread Starter 
What is an average safe voltage for a NB with a stock heatsink/(aftermarket hs)? So when you increase the NB voltage, you are allowing your CPU to go higher whilst still keeping your memory higher? I know that when I increase my CPU sometimes, I can't keep my memory as high, i have to sometimes lower it to 800 or sometimes even 756 (x2).
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post #4 of 9
Quote:
Originally Posted by EyedClock View Post
What is an average safe voltage for a NB with a stock heatsink/(aftermarket hs)? So when you increase the NB voltage, you are allowing your CPU to go higher whilst still keeping your memory higher? I know that when I increase my CPU sometimes, I can't keep my memory as high, i have to sometimes lower it to 800 or sometimes even 756 (x2).
For my system with an X38 northbridge, the average volts is 1.3x V and stays around 55C under load ... however it can take a lot more (like 1.5 and 1.6V), but then it starts to run way too hot....

No, when you increase the NB voltage, you aren't doing anything to increase your FSB. When you increase your FSB clock to get higher CPU speeds, depending on how fast your CPU is running, you might need to add some NB volts to make your system stable.
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post #5 of 9
Thread Starter 
Oh, okay, so once you have found a point where the CPU speed and the memory speeds can be matched, you can increase the NB volts to make sure they are stable together. So rather than having a high CPU speed combined with low Memory speeds, you can increase the NB volts to get the memory up higher "AT THE SAME TIME" as the CPU is higher?
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post #6 of 9
The only reason why you would need to bump NB volts, is:

- You're running lots of memory sticks. More memory sticks controlled by your MCH/NB means more stress on your NB, so it might need more volts.
- You're running a high FSB speed (like 1600+ MHz)
- You notice stability issues, like running Prime95 and you notice that it crashes right away (but no Bluescreens or sudden reboots).
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post #7 of 9
Thread Starter 
I do have 4x1GB sticks of Crucial Ballistix....It is so hard to get that stuff about like 960Mhz for some reason, I figured maybe I could get it to 5-5-5-15 with at least 1000Mhz....could it be NB volt up a little to get that more stable with a higher CPU Clock?
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post #8 of 9
Yes, when overclocking memory, you should first try "relaxing" the timings. Once you achieve stability, you can get extra performance by tweaking the memory timings...
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by Rev1 View Post
Yes, when overclocking memory, you should first try "relaxing" the timings. Once you achieve stability, you can get extra performance by tweaking the memory timings...
So get the Speed in Mhz that are "feasible" first and then loosen the timings, followed by the tightening. If I can't get the timings or speed, adjust NB volts?!?!?!?
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The Real Superman
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