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i7-3820 overclock - Page 118

post #1171 of 3097
8/7/12 at 8:33pm
This is 1.42v on the Vcore and I'm running 125x120x40. It always fails at exactly that 3hr mark +/- 10 minutes. I don't think it's the ram causing instability. Also it's always core 3 that fails. Hopefully this helps.

FailBlend.png
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post #1172 of 3097
8/7/12 at 10:19pm
Quote:
Originally Posted by Concept View Post

Wow, very good thread. I have read everything from page 50 to current. I do have a question. What is the consensus on running 1.44v in bios for daily use? I am on an H100. I really want to hit 4.8Ghz stable for 24/7. I'm currently at 1.42v but when I run Prime95 blend mode, core 3 errors out after 3-4 hours. Appreciate the input. I'm trying to run P95 for 12hrs.
1.44V for 24/7 is OK. Just make sure you have good cooling. You might want to put a fan dedicated for cooling the VRMs. Make sure the difference between VCORE & VCCSA not more than 0.4V, DRAM voltage & VCCSA not more than 0.6V.
Quote:
Originally Posted by Sporadic E View Post


I think it's good. Opinions? I Might need to work on trying to lower the vcore a little? I know that 80 on the max is ugly (the house is at 79-80F. Summertime in south Texas, got to love it!) I plan on doing a reseat of the H100 with a new application of AS5. I will run prime after I do that tomorrow.
Es
That are the temps I got when running 4.6GHz at ambient 35C (95F). You might want to check airflow in the casing. Reapply TIM maybe unnecessary, unless you're not using the stock TIM that came with the H100 CPU block.
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post #1173 of 3097
8/7/12 at 10:31pm
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Quote:
Originally Posted by Concept View Post

This is 1.42v on the Vcore and I'm running 125x120x40. It always fails at exactly that 3hr mark +/- 10 minutes. I don't think it's the ram causing instability. Also it's always core 3 that fails. Hopefully this helps.
FailBlend.png
Just do 125x125x38. It is proven to be stable. Most people don't branch out from 100x100 or 125x125.Normally oc is really hit or miss if you do.
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post #1174 of 3097
8/8/12 at 5:53am
Quote:
Originally Posted by Maximuscr31 View Post

Just do 125x125x38. It is proven to be stable. Most people don't branch out from 100x100 or 125x125.Normally oc is really hit or miss if you do.

What voltages do you need to run that speed?
Edited by Concept - 8/8/12 at 6:00am
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post #1175 of 3097
8/8/12 at 9:03am
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Quote:
Originally Posted by kizwan View Post

That are the temps I got when running 4.6GHz at ambient 35C (95F). You might want to check airflow in the casing. Reapply TIM maybe unnecessary, unless you're not using the stock TIM that came with the H100 CPU block.

That was what the thermostat read, actual temp was probably higer but not much. It is not the TIM that came with the H100. I have switched motherboards so that was wiped clean then. I think I need to do it again just to sure. As for fans, 2 front, 2 side, 2 on the rad on top and 1 in the back. I have postive pressure, might need to change the 2 on the rad to exhaust to see if that helps. May not be getting the flow I need due to all the positive pressure.I will mess with all that tonight.

Es
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post #1176 of 3097
8/8/12 at 9:11am
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Quote:
Originally Posted by Concept View Post

What voltages do you need to run that speed?
1.415 I believe. Just looked and confirmed it is 1.415.
Edited by Maximuscr31 - 8/8/12 at 9:19am
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post #1177 of 3097
8/8/12 at 9:18am
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Quote:
Originally Posted by Sporadic E View Post


I think it's good. Opinions? I Might need to work on trying to lower the vcore a little? I know that 80 on the max is ugly (the house is at 79-80F. Summertime in south Texas, got to love it!) I plan on doing a reseat of the H100 with a new application of AS5. I will run prime after I do that tomorrow.
Es
Why are you doing funky multipliers? You can his 4.625 very easily with 125x125x37. The lower multiplier on the core will lower your temps in itself probably. I was able to run 4.6 with 1.38 vcore. Alot of other people run it with less but it took that to keep me from bsod while folding. While folding with that I never hit over 62 accept when my fan filters were clogged. Then it hit 65*. Most of the time I ran 55* while folding 99% on cpu/gpu.Ive read the whole positive pressure argument but honest air doesn't care. If it is building up pressure then their is more air coming in than can flow out. I don't see cases being that restrictive unless you got a 2000cfm fan pushing into a hp case from 1999. I have 4x120mm and 1x200mm in my phantom 410 mid tower case and 3x120mm exhaust fans and I have 0 temp issues with my h100. I think its your choice of multiplier and possible your thermal paste choice or application of said thermal paste.
Edited by Maximuscr31 - 8/8/12 at 9:21am
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post #1178 of 3097
8/8/12 at 10:19am
Quote:
Originally Posted by Sporadic E View Post

That was what the thermostat read, actual temp was probably higer but not much. It is not the TIM that came with the H100. I have switched motherboards so that was wiped clean then. I think I need to do it again just to sure. As for fans, 2 front, 2 side, 2 on the rad on top and 1 in the back. I have postive pressure, might need to change the 2 on the rad to exhaust to see if that helps. May not be getting the flow I need due to all the positive pressure.I will mess with all that tonight.
Es
FANs on the radiator should blow air through the radiator & better work as exhaust. You need a good exhaust FAN at the rear. In my opinion, it should be able to moved air more than intake fans. My rear FAN (exhaust) can go up to 2400 RPM while the two intake FANs at the front only goes up to 1100 RPM max. I don't know their CFM rating because they're Corsair stock FANs. Of course, it's not FAN with high RPM you need to use but a FAN with better CFM rating than intake FANs.
Quote:
Originally Posted by Maximuscr31 View Post

Why are you doing funky multipliers? You can his 4.625 very easily with 125x125x37. The lower multiplier on the core will lower your temps in itself probably.
When using STRAP 125, VCORE doesn't go down much even when CPU idle. This & living in an area with high ambient temperature can make CPU idle temp higher. So, I much prefer max out the multiplier & adjust BCLK a little bit, only a little bit (103 - 107), for overclock. This way when idle or only browsing & watching movie, VCORE will go down to 1.0xxV. This can contribute to lower operating temperature. Of course for higher overclock, will need to use STRAP 125. I did not say don't use STRAP but it's everyone preferences, what they want from their CPU. In my case, it's good to see CPU temps are at middle to higher 30s at 31C ambient while browsing, watching youtube & movies. With STRAP 125, I got lower 40s instead. Of course, temps under load are the same either use STRAP or not.
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post #1179 of 3097
8/8/12 at 10:37am
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I know this is going to sound like a stupid question but what would you say a safe 24/7 vcore would be for the 3820? I'm getting back into overclocking it and I'm wondering what other people use 24/7.

I have a H100 and the idle temps are anywhere from 35 - 40*C and full load temps are ~55*C if this is relevant.

Cheers guys. thumb.gif

EDIT: Previously I had it at 4.625GHz with 1.36(?) vcore but after a couple of weeks the overclock failed, idle temps were around 50*C I believe and full load temps ~65 - 70*C
Edited by Paradigm84 - 8/8/12 at 10:39am
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post #1180 of 3097
8/8/12 at 10:58am
VCORE below 1.5V is consider safe for 24/7. For 4.5 - 4.6GHz, your target for VCORE should be less than 1.38V. YMMV because it all depend on the quality of the chip (CPU). For 4.625GHz, if 1.36V causing instability, try increased it a little bit, e.g. 1.37V.

If you change other voltages too, such as VTT, VCCSA, etc, make sure to follow this rule; make sure the difference between VCORE & VCCSA not more than 0.4V, difference between DRAM voltage & VCCSA not more than 0.6V.
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