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i7 2600K - Reasonable settings and temp?

post #1 of 108
Thread Starter 
Hi,
Well given no one replied yet to my previous question about undervolting PLL I went ahead and played around with that, the multiplier and the VCORE. Here's some of my findings.

My BIOS only allows certain specific voltages to be set, that aren't .005v apart, for PLL voltage, e.g. 1.715v, 1.753v, 1.80xv and so on, or auto.

Initially I tested my previous stable setup with a PLL voltage of 1.715v of the following:
- VCORE: 1.365v
- Multiplier: 45x
- BCLK: 100.2MHz

The above was stable, I didn't do an extensive stress test though. Most of my tests initially are 30-45 minutes, custom settings using up 3/4 of my memory, on Prime95.

I then tried the following with the same PLL voltage:
- VCORE: 1.365v
- Multiplier: 46x
- BCLK: 100.2MHz

Sadly the above crashed about 5 minutes into the test.

Since that I've managed to decrease my initial VCORE voltage from 1.365v to 1.350v and remain stable using the PLL voltage of 1.715v. Unfortunately a VCORE of 1.345v crashed about 7 minutes into the test. I will run an extensive test today and see what it turns up.

My temperatures are at most 73C on a Corsair H70 using AS5. They average around 65-70C after 15 minutes in the test.

Any suggestions or feedback are welcome.
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post #2 of 108
Quote:
Originally Posted by Ixel;14530788 
Hi,
Well given no one replied yet to my previous question about undervolting PLL I went ahead and played around with that, the multiplier and the VCORE. Here's some of my findings.
Before I begin, I just want to say that your other thread is only about 3 hours old. A thread here on OCN that is only 3 hours old is almost nothing: it can sometimes take 12-24 hours or longer to get a reply. For example: I saw it for the first time about 5 minutes ago because I browsed the Unanswered Threads for the first time 5 minutes ago.

Quote:
Originally Posted by Ixel;14530788 
My BIOS only allows certain specific voltages to be set, that aren't .005v apart, for PLL voltage, e.g. 1.715v, 1.753v, 1.80xv and so on, or auto.

Initially I tested my previous stable setup with a PLL voltage of 1.715v of the following:
- VCORE: 1.365v
- Multiplier: 45x
- BCLK: 100.2MHz

The above was stable, I didn't do an extensive stress test though. Most of my tests initially are 30-45 minutes, custom settings using up 3/4 of my memory, on Prime95.

I then tried the following with the same PLL voltage:
- VCORE: 1.365v
- Multiplier: 46x
- BCLK: 100.2MHz

Sadly the above crashed about 5 minutes into the test.

Since that I've managed to decrease my initial VCORE voltage from 1.365v to 1.350v and remain stable using the PLL voltage of 1.715v. Unfortunately a VCORE of 1.345v crashed about 7 minutes into the test. I will run an extensive test today and see what it turns up.

My temperatures are at most 73C on a Corsair H70 using AS5. They average around 65-70C after 15 minutes in the test.

Any suggestions or feedback are welcome.
I don't have any suggestions, but I will say that this fascinates me because I've never considered manually adjusting my PLL voltage.

However, I am curious about one thing: why are you using 100.2 MHz instead of 100.0?
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post #3 of 108
Thread Starter 
Quote:
Originally Posted by TwoCables;14530901 
Before I begin, I just want to say that your other thread is only about 3 hours old. A thread here on OCN that is only 3 hours old is almost nothing: it can sometimes take 12-24 hours or longer to get a reply. For example: I saw it for the first time about 5 minutes ago because I browsed the Unanswered Threads for the first time 5 minutes ago.

I don't have any suggestions, but I will say that this fascinates me because I've never considered manually adjusting my PLL voltage.

However, I am curious about one thing: why are you using 100.2 MHz instead of 100.0?

I see. I adjusted the BCLK by +.2MHz so it's basically an even 100MHz when in Windows, rather than 99.8MHz.
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post #4 of 108
Quote:
Originally Posted by Ixel;14531200 
I see. I adjusted the BCLK by +.2MHz so it's basically an even 100MHz when in Windows, rather than 99.8MHz.
Oh, I forgot that some boards do that.
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post #5 of 108
I was also able to lower the voltage I needed by dropping PLL to 1.7v. It's a nice little miracle worker biggrin.gif

Those temperatures are fine given your voltage and cooler. Still perfectly safe! Welcome to the forum smile.gif
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post #6 of 108
Were you guys at 1.8V before?
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post #7 of 108
Quote:
Originally Posted by TwoCables;14531714 
Were you guys at 1.8V before?

Yeap, that is the stock. I was at 1.75v PLL @ 4.5Ghz with 1.296v and managed to get to 4.6Ghz without a voltage increase. At first it was unstable but lowering PLL down to 1.7v fixed that problem.
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post #8 of 108
Thread Starter 
1.8v is roughly the default PLL voltage. Unfortunately unless it was just something I did, I had to increase vcore by .005v as it froze while I was doing something on the computer. I'm still less than my original vcore however.

What is the opinion on the reasonable/safer voltage to stay with for 24/7 use?

I use offset mode, which allows my system to dynamically decrease or increase the voltage based on the CPU usage. Loadline calibration is also at level 3 (originally level 5 before I started overclocking it). Currently offset I believe is set at +0.010v for the 45x multiplier, PLL voltage is still roughly 1.71v.
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post #9 of 108
Quote:
Originally Posted by Ixel;14531753 
1.8v is roughly the default PLL voltage. Unfortunately unless it was just something I did, I had to increase vcore by .005v as it froze while I was doing something on the computer. I'm still less than my original vcore however.

What is the opinion on the reasonable/safer voltage to stay with for 24/7 use?

I use offset mode, which allows my system to dynamically decrease or increase the voltage based on the CPU usage. Loadline calibration is also at level 3 (originally level 5 before I started overclocking it). Currently offset I believe is set at +0.010v for the 45x multiplier, PLL voltage is still roughly 1.71v.


Safe 24/7 voltage is a matter of opinion and varies from person to person. The Sandy Bridge spec sheet says 1.52v is the maximum but but 1.35-1.38v is recommended as the max to maximize the life of your CPU.

It all depends on your cooling, bravery, and current financial position. If 200-300 for a new CPU is a huge hit then I would keep the voltage <1.4v. 1.5v won't kill your CPU by any means but there are always extremely unlucky chips/conditions. People have been running 1.46+ for months without any problems.
Edited by nezzarix - 8/10/11 at 8:49am
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post #10 of 108
Quote:
Originally Posted by nezzarix;14531742 
Yeap, that is the stock. I was at 1.75v PLL @ 4.5Ghz with 1.296v and managed to get to 4.6Ghz without a voltage increase. At first it was unstable but lowering PLL down to 1.7v fixed that problem.
Whoa. When you say it was unstable, do you mean not stable enough to run Prime95 Blend for 12 hours, or what do you mean?

Quote:
Originally Posted by Ixel;14531753 
1.8v is roughly the default PLL voltage. Unfortunately unless it was just something I did, I had to increase vcore by .005v as it froze while I was doing something on the computer. I'm still less than my original vcore however.

What is the opinion on the reasonable/safer voltage to stay with for 24/7 use?
The guy named Juan Jose ("J.J.") who is the Senior Technical Marketing Specialist at ASUS says that about 1.425V is about the maximum for 24/7 use, so I go by that. smile.gif

Quote:
Originally Posted by Ixel;14531753 
I use offset mode, which allows my system to dynamically decrease or increase the voltage based on the CPU usage. Loadline calibration is also at level 3 (originally level 5 before I started overclocking it). Currently offset I believe is set at +0.010v for the 45x multiplier, PLL voltage is still roughly 1.71v.
Well damn. This is intriguing. Although I'm using 48x, so I expect different results. smile.gif
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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