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E6850 unstable at 3.6Ghz

post #1 of 13
Thread Starter 
Hi all, I'm new to OC'ing, but I have been doing my homework. I have had my system stable at 3.4Ghz. When I push it to 3.6Ghz, it crashes when running prime95 and occt. My temps are good, core 0 and 1 at ~25 idle and ~45 underload according to everest, core temp, and occt. I can boot windows OC'ed at 3.6Ghz just can't finish the stress tests.

Here are my BIOS specs.
FSB 400Mhz (linked with memory)
DRAM frequency 800Mhz
Vcore voltage 1.5
DRAM voltage 1.95
Northbridge voltage 1.4
spread spektrum off

I'm affraid of increasibg my cpu voltage. 1.5 already seems high. I will go back to 3.4Ghz at 1.45 Vcore until I get some feedback.

System specs in sig.
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post #2 of 13
I would set your nb at 1.55 back off the vcore a notch what are your other settings in the bios? is everything else on auto? when i took my 6850 above 3.6 i manually set all the other voltages to the minimum and all was good. i also found that transaction booster set to disabled was needed for stability.
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post #3 of 13
Set ICH to 1.6v to see how it goes. Watch out the temp.
post #4 of 13
Thread Starter 
Quote:
Originally Posted by Bonehead View Post
I would set your nb at 1.55 back off the vcore a notch what are your other settings in the bios? is everything else on auto? when i took my 6850 above 3.6 i manually set all the other voltages to the minimum and all was good. i also found that transaction booster set to disabled was needed for stability.
I tried this but, it did not help. I did however up my VCore to two clicks past 1.5 (I don't remember the actual number) I ran OCCT and Prime95 just fine, although I had a memory error in Prime95, I will troubleshoot that later. Even with the higher voltage my CPU was now where near overheating. How high can I pump this thing? Can I put as much voltage into it as long as it's not overheating? I think mobo goes up to 1.7. That seems extremely high and I don't plan on trying it.
Edited by engineered044 - 6/11/08 at 5:28pm
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post #5 of 13
Quote:
Originally Posted by engineered044 View Post
I tried this but, it did not help. I did however up my VCore to two clicks past 1.5 (I don't remember the actual number) I ran OCCT and Prime95 just fine, although I had a memory error in Prime95, I will troubleshoot that later. Even with the higher voltage my CPU was now where near overheating. How high can I pump this thing? Can I put as much voltage into it as long as it's not overheating? I think mobo goes up to 1.7. That seems extremely high and I don't plan on trying it.
That is way too much voltage, temps be damned. The issue is not your CPU voltage, its probably a memory setting causing you to be unstable.
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post #6 of 13
1.55 northbridge, and Set PCi-e FSB to 110, And well let these guys explain, I don't have time to Talk lol
post #7 of 13
Thread Starter 
Let me clear something up. I did more research and have discovered a noob mistake I was making. What I said about being stable at 3.6Ghz at 1.5V+ volts was incorrect. The voltage number I was giving was actualy my BIOS VCore voltage. I thought that whatever I set the BIOS VCore to was my desired CPU voltage. I am currently OC'd to 3.6Ghz (and stable) at about 1.4~1.42 volts under load, and my VCore set a touch above 1.5V.
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post #8 of 13
turn your voltage down a notch like someone else said, 1.5 is a tad too high
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post #9 of 13
That is a big vdroop you having there. That could be one of your problem. I did the v mod for this old board and now am get -03 vdroop. It help out a lot. I was able to get it to 3.9@1.46.
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post #10 of 13
Quote:
Originally Posted by engineered044 View Post
Let me clear something up. I did more research and have discovered a noob mistake I was making. What I said about being stable at 3.6Ghz at 1.5V+ volts was incorrect. The voltage number I was giving was actualy my BIOS VCore voltage. I thought that whatever I set the BIOS VCore to was my desired CPU voltage. I am currently OC'd to 3.6Ghz (and stable) at about 1.4~1.42 volts under load, and my VCore set a touch above 1.5V.

You need to enabled "Loadline Calibration" or "Voltage Damper", it reduce the droop a lot. With it enabled you should be able to set 1,45 or lower in BIOS and be stable.
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