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System unstable with high NB clock

hat

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#1
I've discovered that my memory performs quite a bit better when I run my NB at 2500MHz compared to 2000MHz. In the AIDA64 memory benchmark, there's an improvement across the board in all areas, and not just in my memory, in my L1, L2 and L3 caches too. The problem is the system goes unstable when the NB is set to 2500MHz. What should I change? I can change CPU voltage, memory voltage, NB voltage and CPU NB voltage. For now, I've dropped the HT link speed down to 2000MHz while keeping the NB clock at 2500MHz to see if maybe the HT link went unstable. Specs to the left.
 

fullinfusion

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#2
just turn up the cpu/nb volts a bit.
 
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erocker

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#3
CPU/NB voltage is the "northbridge" voltage as it is listed in CPU-Z. It's really the memory controller. Keep HTT at 2000mhz, there's no reason to go higher and it makes no difference.
 

hat

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#4
Here's some before and after images. I'm not raising the HT link, just the NB frequency. I take it the voltage I need is CPU NB VID control?


 

fullinfusion

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#5
You betcha. Do you know what the voltage is reading in the bios?
 
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hat

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#6
Stock is 1.15v. That failed within 10 minutes. I tried 1.175v, crapped out around 45 minutes. Now at 1.2v...
 

fullinfusion

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#7
Stock is 1.15v. That failed within 10 minutes. I tried 1.175v, crapped out around 45 minutes. Now at 1.2v...
your going to probably doing to need 1.275ish Im thinking. 1.30v is still ok for 3000MHz :p
 

hat

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#8
Tested one hour stable at 1.2v, going to run it through the 8 hour test later tonight while I sleep.
 
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#9
Stock is 1.15v. That failed within 10 minutes. I tried 1.175v, crapped out around 45 minutes. Now at 1.2v...
You are not raising the right one? , you need to raise the CPU NB Vid control & not the NB voltage
The CPU NB VID Control should be at 1.2v stock & for 2500+ NB stable you will need about 1.350-1.375v
Mine is running at 1.4250v for 2660 NB

Also as Erocker said keep the HTT at +- 2000 , i keep mine at auto & stock voltage
 
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erocker

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#10
Here's some before and after images. I'm not raising the HT link, just the NB frequency. I take it the voltage I need is CPU NB VID control?
^ Yes, that is the voltage he is adjusting.
 

hat

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#11
Mine is 1.15v stock and passed occt for 1 hour stable at 1.2v. Maybe you need a higher voltage because you have a quad? I'm not sure if it's totally stable yet, will do a longer test overnight.
 
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#12
You are not raising the right one? , you need to raise the CPU NB Vid control & not the NB voltage
The CPU NB VID Control should be at 1.2v stock & for 2500+ NB stable you will need about 1.350-1.375v
Mine is running at 1.4250v for 2660 NB
Your CPU NB VID voltage is too high, or you have a poor performing chip.

To OP, no more than 1.25v should be enough for 2500 mhz NB to be stable; somewhere between 1.21 and 1.25 should be enough, depending on how many sticks of RAM you're using and how much (if at all) you're overclocking the RAM.
 

hat

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