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Is it the heat or the voltage?

post #1 of 10
Thread Starter 
I'm fairly new to OCing and it seems like the really fast rigs run high voltages and use sophisticated cooling to keep them cool. What is the killer, the voltage or the heat. And if it's a combination of the two, does anybody have info on where the danger zone begins for Sandy Bridge chips?
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post #2 of 10
More voltage == more heat (No, it is not a linear rise so don't be decieved haha )

Anywho, you hit 1.5V on SB and you'd better have an incredible cooling system.

I'd say stay below 1.45 volts (Personally, I'll never hit 1.4 volts. ) if you are under water or have really good air-cooling. Else, play with the 1.3's and see how that plays out. Most people can reach 4.5Ghz with ~1.3 volts.

I wonder why you ask as you have your 2500k at 5.0 Ghz with a silver Arrow...
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post #3 of 10
More voltage=More heat
More OC =More Heat
More heat=More heat

Quote:
Sandybridge maximum safe voltages

Core Voltage - Not recommended too exceed 1.38v, doing so could kill the CPU, we therefor recommend a range of 1.325-1.350v if overclocking.
Memory Voltage - Intel recommend 1.50v plus/minus 5% which means upto 1.58v is the safe recommended limit. In our testing we have found 1.65v has caused no issues.
BCLK Base Clock - This is strictly a NO, anyone using base clock overclocking could/will cause damange to CPU/Mainboard. (Set manually to 100)
PLL Voltage - Do not exceed 1.9v!!



Processor - Basically we recommend customers not to exceed 1.35v to play it safe, all our bundles are set at 1.3250v or lower, any competitors offering bundles above 4.6GHz you should be enquiring as to what voltage they are using as we believe anything over 1.38v will limit CPU lifespan and anything over 1.42v will likely kill the CPU or severely limit its lifespan.

Memory - Intel recommend 1.50v plus/minus 5% which means 1.60v is the ideal safe maximum, but we have found in our testing all 1.65v memory is fine. We have also found most new 1.65v like Corsair XMS3 will run at its rated timings with just 1.50-1.55v which is well within Intel specifications. So people upgrading to Sandybridge you can still use your old DDR3, but we do recommend you run it at 1.60v or less. We are shipping most of our bundles which feature Corsair XMS at 1.50v-1.55v at rated timings. We've also discussed with Asus and MSI regarding voltages for memory and they also confirm in their testing 1.65v caused no issues with reliability.

Base Clock - To put it simple if you value the life of your components, do not overclock using base clock!

PLL Voltage - Again do not exceed 1.9v!


These are just guidelines we recommend you follow, if you want to push more voltage through your CPU's then just be aware they could die on you. Your warranty is un-affected and we will honor any CPU's that die, we just won't ask questions as to how you killed them.

Not all CPU's are as fragile as others, we have experimented upto 1.50v Vcore and 1.70v memory and had zero issues with reliability, so it seems some of fine when pushing hard.
Answers here : source

Quote:
Originally Posted by dklimitless View Post

I wonder why you ask as you have your 2500k at 5.0 Ghz with a silver Arrow...
lol
Edited by KaRLiToS - 7/16/11 at 1:40pm
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post #4 of 10
To many volts will degrade the CPU over time
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post #5 of 10
Bit of both. 45 nm Experiment. This was on an older chip but, it was the voltage (1.6v 24/7 and stress testing) that kinda sorta damaged the chip. It burnt a few pads but it still worked and oc'ed stable.

This crappy E7400 has had serious voltage running through it for YEARS. Right now it's at 1.424v CPU-Z/1.45v BIOS for 4GHz. It's had at least 1.42v volts running through it for at least 2 years now. Works fine. Same as always.

No burnt pads or anything. So, in my opinion, from what I've seen here at OCN and done here--if you've got great cooling you'll have great results. Period.

Edit: Look at the date on this: 1.45v for 4GHz I got it lowered after a BIOS update.
Edited by crashdummy35 - 7/16/11 at 1:56pm
 
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post #6 of 10
Quote:
Originally Posted by dklimitless View Post

I wonder why you ask as you have your 2500k at 5.0 Ghz with a silver Arrow...
I was thinking the same thing..... he's already got to 5.0GHz before even knowing more voltage produces more heat...
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by dklimitless View Post
More voltage == more heat (No, it is not a linear rise so don't be decieved haha )

Anywho, you hit 1.5V on SB and you'd better have an incredible cooling system.

I'd say stay below 1.45 volts (Personally, I'll never hit 1.4 volts. ) if you are under water or have really good air-cooling. Else, play with the 1.3's and see how that plays out. Most people can reach 4.5Ghz with ~1.3 volts.

I wonder why you ask as you have your 2500k at 5.0 Ghz with a silver Arrow...
I asked because I was told that my voltage was too high. I backed down the speed to 4.8 and voltage to 1.45. The Idle temps are still the same, 29-31. Load temps are lower but only on torture tests. Normal use they are about the same. I do have a Silver Arrow with 2 fans. But in addition the case has 4 230 mm fans and 4 120's, so air flow is very good.
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post #8 of 10
Quote:
Originally Posted by Mule928 View Post
I asked because I was told that my voltage was too high. I backed down the speed to 4.8 and voltage to 1.45. The Idle temps are still the same, 29-31. Load temps are lower but only on torture tests. Normal use they are about the same. I do have a Silver Arrow with 2 fans. But in addition the case has 4 230 mm fans and 4 120's, so air flow is very good.
Hmm, well. If you "backed down" to 1.45 volts, I can only shudder at the thought of your previous vcore. Hey, wanna try to make one of those videos of cooking an egg on a CPU?

Seriously though, idle temps aren't very useful for the most part. Pray tell, what torture tests do you run, for how long, and what are your load temps? If you mention IBT and anything less than 80C, I'll be thoroughly impressed...

(The Silver Arrow is a really good air cooler, but water cooling serves other purposes besides e-peen, contrary to what some think. )

As overclocker23578 mentioned earlier, high volts will degrade the chip over time. More voltage = faster death. As per the findings of KaRLiToS, at 1.45V, you are pushing it. There is a reason why Intel didn't clock all their 2500k's at 5.0Ghz and pump >1.45volts through them.

We are talking about silicon chips and circuits, high voltage = high heat which will degrade the chips over time and affect their lifespans badly.

Also, the number of fans doesn't necessarily indicate good airflow; If I have 8 fans with only two being intake, I'll mostly be pooped airflow wise. Not saying you don't know your case cooling, just saying you should keep that in mind

Anyway, post your temps for Prime/IBTand lets see just how hot your CPU gets (If it hits 80's, kill the test. While 80C won't kill the CPU, I wouldn't recommend it as a healthy temp either. However, for a torture test, 80C isn't too bad. I personally like to keep things under 70C however)

Disclaimer: If IBT or Prime95 makes your system die, it is not my fault... you have been warned
Edited by dklimitless - 7/19/11 at 5:20pm
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post #9 of 10
Thread Starter 
Prime 95 2 cores maxed at 74. The other 2 at 71 & 72. I considered water cooling. But when I picked this case I did so with the knowledge that almost all closed course race track records are still held by the Porsche 917K, a turbocharged, twelve cylinder, air cooled race car from the 70's. Air cooling is very effective with enough air. Intake on my case is 2 230's & 2 120's. Exhaust is the same.
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post #10 of 10
Quote:
Originally Posted by Mule928 View Post
Prime 95 2 cores maxed at 74. The other 2 at 71 & 72. I considered water cooling. But when I picked this case I did so with the knowledge that almost all closed course race track records are still held by the Porsche 917K, a turbocharged, twelve cylinder, air cooled race car from the 70's. Air cooling is very effective with enough air. Intake on my case is 2 230's & 2 120's. Exhaust is the same.
Well, buddy, if you're in the 70's with 1.45V, then you are fine-ish heat-wise.Though if you want heat, either P95 Small FFT's or IBT with AVX (the latter has been reported to cause temps as high as 10C over prime, jsyk. Other have had less than 4C difference ) Just bear in mind that you are most likely degrading the chip albeit slowly at 1.45v
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