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NorthBridge Voltage and CPU-NB Voltage?

post #1 of 6
Thread Starter 
I have so many questions but mainly these will do.

1. What's a good voltage for NorthBridge? My current value is 1.2. That maybe too low for overclocking past the 3ghz+ range, IDK for sure.

2. What's a good value for CPU-NB voltage for overclocking?

Currently I'm reading the "Voltages" sticky to try and figure out the difference between CPU-NB Voltage and NB Voltage. I need to know which one to increase for proper overclocking.
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post #2 of 6
Hi.

1- I'm using mine at 3000MHz with 1.325V, but some people recommend don't go above 1.3V in air.
2- That value depends of your CPU, some only support 2600MHz other can hit the 3000MHz, so, you need find your. More higher more better.
3- NB voltage on "Auto", CPU-NB is the one that you need change.
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post #3 of 6
Quote:
Originally Posted by Acitone;12075997 
I have so many questions but mainly these will do.

1. What's a good voltage for NorthBridge? My current value is 1.2. That maybe too low for overclocking past the 3ghz+ range, IDK for sure.

2. What's a good value for CPU-NB voltage for overclocking?

Currently I'm reading the "Voltages" sticky to try and figure out the difference between CPU-NB Voltage and NB Voltage. I need to know which one to increase for proper overclocking.


!st. You probably don't need to raise this much as it controls the actual chipset voltage, stock is probably about 1.1v (is on my CHIV) 1.2 won't hurt anything. (currently have my up to 1.225v)

2nd. CPU/NB controls integrated memory controller in the CPU. This what you'd adjust to help stabilize the system. A lot of people can run this in the 1.3-1.40v range depending on the setup. Max safe CPU/NB Voltage is 1.4-1.45v depending on who you ask. I see some CHIV owners run it as high as 1.5v+. Hope this gives you an idea.

My setup is like this,
CPU 4013MHz Vcore=1.40v, (250.8 x 16)
NB Freq 3010MHZ CPU/NB=1.375v
NB=1.225v
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post #4 of 6
Thread Starter 
Wow thanks for the great info people. I have a decent idea now how it works. Basically, to simplify, NB Volts don't need touching. CPU-NB increasing is what needs to be touched, don't go above 1.4v. Got it, and with all things considered in my case (AHEM! ....msi...*grunt*).. I will do it little by little.

Anyone care to share what you run your SB Voltage at?
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post #5 of 6
Here are my voltage settings:

1- DRAM: 1.65V
2- SB: Auto
3- HT: "Auto"
4- NB: 1.150V
5- CPU-NB: 1.325V
6- CPU: 1.325V

My rig is dead for now, so, I can't confirm the temps.
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post #6 of 6
NB voltage is the voltage applied directly to the NB. Honestly I don't think it affects much. Perhaps if you are running a multi GPU setup, upping the voltage may help a little. And for extremely high FSB, then I guess it might help a little.

CPU-NB voltage is much more important. This is essentially the voltage of your CPU's memory controller. So, when you are running faster RAM, tightening the timings, and/or raising your NB frequency, this is the voltage you want to be increasing. The "safe" voltage is said to be the same as your vcore, which most people consider 1.55v+ for Phenom II. There is no "good" value. You set it to whatever it takes to be stable. If you're running fast memory, start it out at 1.35v and work your way up. Prime95 blend test is good for testing the CPU + memory controller + RAM are playing nice together.

SB voltage rarely needs to be touched. Since the SB controls SATA connections, the only plausible reason to increase it in my eyes would be if you're running all 6 SATA ports populated with hard drives or something.
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