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NB/SB/HT voltages are weird!

post #1 of 4
Thread Starter 
Okay, so I heard overclocking the northbridge clock speed helps PIIs perform in Starcraft II by a great deal, so I decided I would try it.
However, for some reason when I set voltages to auto and OC the NB, it's either a failed boot or a BSOD.
So I tried to manually set the voltages myself, but when I tried to increase the NB voltage, SB and HT voltages also increased, and I realized those 3 were somehow locked together (so raising or dropping one of those 3 would make all of them go up or down too)
The motherboard displays red # if it thinks voltages get too high, and apparently my HT volts are too high when my NB volts reach beyond 1.22V, and I think I need at least 1.3V to reach beyond 2.8GHz NB clock speed...
Is there a fix for this? Or am I stuck with this horrible option...
By the way, the BIOS is up to date.
Not enough mana!
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Not enough mana!
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post #2 of 4
Quote:
Originally Posted by jyparkcan View Post
Okay, so I heard overclocking the northbridge clock speed helps PIIs perform in Starcraft II by a great deal, so I decided I would try it.
However, for some reason when I set voltages to auto and OC the NB, it's either a failed boot or a BSOD.
So I tried to manually set the voltages myself, but when I tried to increase the NB voltage, SB and HT voltages also increased, and I realized those 3 were somehow locked together (so raising or dropping one of those 3 would make all of them go up or down too)
The motherboard displays red # if it thinks voltages get too high, and apparently my HT volts are too high when my NB volts reach beyond 1.22V, and I think I need at least 1.3V to reach beyond 2.8GHz NB clock speed...
Is there a fix for this? Or am I stuck with this horrible option...
By the way, the BIOS is up to date.

Sounds to me like you increased the wrong voltage. NB Voltage is for the chipset, leave that on auto.
Lets get the lingo down first lol,

You want to OC the Ref Clock Freq (HTT, Intel calls it FSB) READ this thread for more info http://www.overclock.net/amd-general...ing-guide.html it will give you tons of info and give you a path to follow.

The ref clock is a base freq that affects everything else on the mobo, HT, NB Freq, Ram Freq etc. You should really study that link to get a good idea of how it's done the right way ok?

The NB Freq has it's own multiplier to raise or lower it (CPU/NB Freq) voltage for this is called CPU/NB Voltage or VDDNB. Stock 1.2v, as you raise the NB Freq make SMALL changes and test in between till stable. You'll want it as high as possible. Depending on your cpu freq (3.6-4.0GHz) maybe in the area of 2600-3000MHz. This usually takes around 1.3-1.35v with a max of 1.4-1.45v.

HT Link Speed should be as close as possible to 2000MHz (+/- 100MHz) which should be stock speed, so no reason to increase any voltage, can be left on auto for now. This also has it's own multiplier when it comes time to lower after raising the ref clock.

The Ram Freq will be affected the same way as you raise the ref clock so you'll need to keep the freq as close to stock as possible and deal with OC'ing the ram later. Be sure to manually enter Dram Freq, timings and Dram voltage into bios.

I highly recommend doing some studying of that link above first, and make small changes with testing in between with prime95. As you learn a bit and have questions ask for more help. Always happy to help!!!
Edited by The Sandman - 1/24/11 at 11:37pm
 
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Bruce
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post #3 of 4
Thread Starter 
Thanks a lot for the info, but I think you missed my point.
My main problem is that NB/SB/HT voltages are locked together for some reason and therefore cannot be altered individually.
Not enough mana!
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Not enough mana!
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post #4 of 4
When you OC your NB(CPU/NB), you have to raise your CPU/NB voltage. Keep NB,SB and HT voltages AUTO
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