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Opty 165: need mobo voltages help

post #1 of 8
Thread Starter 
Ok i'm trying to get my opty 165 up to 3Ghz, before I start seriously pushing it though I need some help.

My mobo at present is the Abit AN8-SLI Fatal1ty. In the BIOS there are the following voltage values that I can change (see bios image below):
  • CPU Core Voltage
  • DDR VTT voltage
  • nforce4 voltage
  • Hypertransport voltage
  • DDR Ref. Voltage
  • CPU Ref. Voltage

I know that I need to up the cpu core voltage when I get stability problems OC'in my CPU and that my DDR VTT voltage needs to be increased when OC'in my RAM, but I have NO CLUE what the other values are for and when I would need to increase them when overclocking.

If someone could explain what all the other values are for, at what points I would need to increase them, and what are the dangerous values to not cross it will be a rep+ for you

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post #2 of 8
CPU Core Voltage - important for your CPU
DDR VTT voltage - memory voltage
nforce4 voltage - northbridge voltage
Hypertransport voltage - ? never heard of increaseing the voltage to the HT
DDR Ref. Voltage - raise by percentage points maybe past 2.85v?
CPU Ref. Voltage - raise by percentage points maybe past 1.4v?

w/ CCBWE stepping you'll be lucky to reach 2.8 Ghz honestly. try 2.7 first. run 300 x 9 w/ 1.35v and see what happens.
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by mudd View Post
CPU Core Voltage - important for your CPU
DDR VTT voltage - memory voltage
nforce4 voltage - northbridge voltage
Hypertransport voltage - ? never heard of increaseing the voltage to the HT
DDR Ref. Voltage - raise by percentage points maybe past 2.85v?
CPU Ref. Voltage - raise by percentage points maybe past 1.4v?

w/ CCBWE stepping you'll be lucky to reach 2.8 Ghz honestly. try 2.7 first. run 300 x 9 w/ 1.35v and see what happens.
hmm... ok so that gives me my limits, but when and why should I raise the other values? Like if I want a fsb of 350 should I be increasing the HT voltage and NF4 Voltage?

Also my complete stepping is CCBWE0550UPMW, its not the best by a long shot but quite a few people over at XS.org are getting 3Ghz+ with them, so i'm hopefull . I've already had it running orthos stable for a few hours at 2.7Ghz @ 300x9, but I wanted to get my info right about the other votlages before pushing the fsb further. Does the NB control the FSB? Will I need to increase its voltage to get higher fsb clocks? Also what effect does the DDR/CPU ref. voltage have? The abit manual is rubbish
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post #4 of 8
North bordge voltage may need to be increased to stabalize the FSB. Only up it to find stability.
CPU and RAM ref. voltage... is that "Referance" ... unfirmiliar with Abits and some of there BIOS terms.
    
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post #5 of 8
likewise hypertransport voltage may need to be increased slightly, but only if you need it for stability.

basically leave all the voltages alone and just bump up your htt until you're not stable then increase cpu voltage a hair and try again
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post #6 of 8
i just noticed you had the CCBWE stepping. Good luck in trying to get that to 3 GHz. i've seen some other watercoolers not even be able to hit 2.9 GHz on it. try to get it to 2.8 and keep it there. if you want to take a chance ona suicide run, pump it up to 1.6v+ and you might be able to see the 3 ghz mark.
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post #7 of 8
Thread Starter 
this is why I want to go DFI more support as most OC'ers have them and know their BIOS inside out. The ref. is for reference voltage. It goes up and down in values to choose like this (+1v, +0.75v, +0.5v, +0.25v, -0.25v, -0.5v... etc) Any idea what they are for?
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post #8 of 8
pfft, my MSI board can overclock just like any DFI board (unless its w/ BH-5 memory)....
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