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Safe to run 4.2ghz at 1.5v 24/7? - Page 6

post #51 of 60
Thread Starter 
Well ran small ffts for an hour and it did fine but one core had a rounding error on blend. Gonna bump the vcore to 1.425 and try again.
    
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post #52 of 60
Thread Starter 
Still struggling to get it stable can pass small and large ffts but falls on it's face when it comes to blend. It almost always bsods with a 124 code.
    
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post #53 of 60
Quote:
Originally Posted by dman1320 View Post
Still struggling to get it stable can pass small and large ffts but falls on it's face when it comes to blend. It almost always bsods with a 124 code.
Try changing your DDR3 Command Rate from 1T to 2T. This helped me in many cases where DRAM voltage had no effect, but 2T ran super stable. 2T is more stable, 1T is slightly faster (2-3%).
post #54 of 60
I clearly said your error is happening because of voltage missing. Not all chips are the same, some can make 4GHz with 1.385v , some with 1.55v. But still you need some voltages (1.55v is the max voltage) and the best 7/24 voltage is 1.5v don't go over him.
    
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post #55 of 60
Sorry to post here, but can you just quickly tell me the difference between NB core voltage and CPU/NB voltage? I am also having issues with NB clock even thou my CPU is super stable at 4.4ghz 1.6v and gaming stable at 1.52v(not 24/7 usage)... So basicly my question is what voltage do i bump up for NB at 3ghz and what voltage i bump up for FSB at 250?
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post #56 of 60
Thread Starter 
stability!!! 1.4 vcore and 1.4nb at 4000mhz cpu and 3000 cpu nb. ram at stock settings. 200x20. now to shoot for 4.2 ghz. what approach do you guys think i should try next?
    
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post #57 of 60
Thread Starter 
And I think I figured something else out too. I left the ht link speed at auto and it always put it at 2600mhz or above. When I tried stability testing 4.1ghz on 1.4vcore, one core got a rounding error after 3 tests. But when I dropped the ht link speed to 2000 MHz, it got farther in prime. Would that have been contributing to instability also?
    
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post #58 of 60
i can only manage 3.9 ghz on 1.425v, consider yourself lucky :/
post #59 of 60
Quote:
Originally Posted by dman1320 View Post
And I think I figured something else out too. I left the ht link speed at auto and it always put it at 2600mhz or above. When I tried stability testing 4.1ghz on 1.4vcore, one core got a rounding error after 3 tests. But when I dropped the ht link speed to 2000 MHz, it got farther in prime. Would that have been contributing to instability also?
Always Keep HT Link 2000Mhz +/- 100Mhz. HT Link (Hypertransport bus/link) will degrade performance and increase instability (due to signal degrading) beyond 2350Mhz - and there's no guarantee that yours will go that far without degrading. Having said that, there is nothing gained by overclocking the HT Link - it's merely a pipeline (albeit a pipeline used to carry data for just about everything on the board).

CPU/NB (IMC/NB) should be overclocked as high as you can get it. For each 10% you increase the CPU/NB speed, memory bandwidth is increased 3-4% and latency is reduced 3-4%. Minimum for RAM is 3x the base speed so for example (800mhz base (1600Mhz memory) x 3) = 2400Mhz CPU-NB. When overclocking you need to close the gap on the CPU as well, so for 4GHZ the minimum for stability is around 2600Mhz ~ (CPU-NB) (+/-200) = (4GHZ * 2 ) / 3.15. But again you will see big performance gains for every 10% you manage. You may need to bump up CPU/NB voltage to reach higher speeds and anywhere up to 1.5v is fine.

Here's how both of those work together. Data sent to the CPU is first sent to the Crossbar, which then distributes it to the different cores of the CPU. That data has instructions to either be stored in CPU Cache, go to system RAM to be stored for easy access, or be sent back out to wherever it needs to go. When it is sent to RAM, the IMC or Northbridge takes the data so that it can distribute it within RAM. If any data is to be called from RAM, the CPU requests it from the Northbridge. This data travels along the CPU to RAM on the HyperTransport bus (HT Link).

Hope that helps.
Edited by ALUCARDVPR - 11/8/11 at 9:29pm
post #60 of 60
Dman I have an H80 and I am running 1.55v at 4.2. I can rock my NB up to 3200 if I want with 1.35 volts and my ram (New 2x4 kit sucks) is at 1333 2t. HT should be kept at 2000 if possible. I could run 4.0 at 1.375... Shows you what a wall we have on these chips.

1.55v is high, but if you really want the performance and you can keep temps under 55c you can go up to 1.6. I am tempted to suicide my chip even though its not a great performer but I need the money for a new one in case first!
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