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Do I need to enable PPL Overvoltage to get to 4.6+ GHz on i5 2500k?

post #1 of 10
Thread Starter 
I'm running my i5 on 4.5GHz stable for months with PPL Overvoltage disabled and offset voltage +0.010 on automatic. The system runs stable and cool for months now, so today for the first time I tried to put the multiplier to 46 and see it got a BSOD 10 minutes into Prime95.

Since I am not an overclocking expert by any means, I am wondering whether I should have enabled PPL Overvoltage in order to reach 4.6GHz and above, or perhaps change the +0.010 offset to another value.

Automatic voltage at 4.5GHz peaks at 1.35V(according to CPU-Z), so in theory I should have room for more, right? As far as I know the maximum safe voltage is 1.4V for 24/7 use or do you have another opinion on this?

Thanks for the help!
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post #2 of 10
Quote:
Originally Posted by Demarki View Post
I'm running my i5 on 4.5GHz stable for months with PPL Overvoltage disabled and offset voltage +0.010 on automatic. The system runs stable and cool for months now, so today for the first time I tried to put the multiplier to 46 and see it got a BSOD 10 minutes into Prime95.

Since I am not an overclocking expert by any means, I am wondering whether I should have enabled PPL Overvoltage in order to reach 4.6GHz and above, or perhaps change the +0.010 offset to another value.

Automatic voltage at 4.5GHz peaks at 1.35V(according to CPU-Z), so in theory I should have room for more, right? As far as I know the maximum safe voltage is 1.4V for 24/7 use or do you have another opinion on this?

Thanks for the help!
It's Internal PLL Overvoltage, not PPL.

Anyway, what do you mean by "offset voltage +0.010 on automatic"?

The maximum safe for 24/7 is about 1.425V but some people feel that this is a rather conservative number. So in other words, increase the Offset voltage up to something like +0.015, or +0.020, or whatever works to make the system pass 12 hours of Prime95's Blend.

The main reason for enabling Internal PLL Overvoltage is to get a system to boot that cannot boot when a higher multiplier is used.
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
It's Internal PLL Overvoltage, not PPL.

Anyway, what do you mean by "offset voltage +0.010 on automatic"?
Hey there, I mean that I didn't manually select the voltage, I have it on automatic and the system changes the voltage depending on the use, for example on idle it's around 0.9V and it bumps to 1.32-1.35V when stressed.

I have selected offset and there was a value below, I have chosen that value to be +0.010 but I am not sure what it does, shall I change that value or leave it as it is? For example what would happen if I put +0.005 or +0.050 instead?

Again sorry if the questions sound silly, I am new to overclocking and I try to learn from reading various topics on this site.
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post #4 of 10
Quote:
Originally Posted by Demarki View Post
Hey there, I mean that I didn't manually select the voltage, I have it on automatic and the system changes the voltage depending on the use, for example on idle it's around 0.9V and it bumps to 1.32-1.35V when stressed.
Oh. That's not "automatic", though. I mean "automatic" would mean that you didn't enter an Offset voltage but instead just left the Offset on "Auto" (instead of entering 0.010). So that is why I was confused.

So you're using the Offset mode with a manually-entered Offset voltage. Although, we don't have to call it a "manually-entered" Offset voltage because that becomes clear when you say that you entered 0.010.


Quote:
Originally Posted by Demarki View Post
I have selected offset and there was a value below, I have chosen that value to be +0.010 but I am not sure what it does, shall I change that value or leave it as it is? For example what would happen if I put +0.005 or +0.050 instead?
If you use +0.005, then the voltage will be lower. If you use anything higher than +0.010, then the voltage will be higher. So like I said, try +0.015 to start with, or try +0.020, or +0.025... etc.


Quote:
Originally Posted by Demarki View Post
Again sorry if the questions sound silly, I am new to overclocking and I try to learn from reading various topics on this site.
Nah, it's all good.

Here's something else: I've noticed that the Offset is just the difference between the VID and your desired core voltage (under full load). I recommend using Real Temp 3.67 both for monitoring temps and for learning what your VID is:




Click this button. If your VID is way lower than what mine is here, then put some load on the CPU.

However, the LLC setting also helps determine which Offset you will need to use. The higher the LLC, the less vDroop there will be and so therefore the less compensation you'd need. In addition, the multiplier you're using can change the VID.

For me, I'm using Ultra High which is the 2nd highest setting which happens to almost eliminate my vDroop. My desired full-load core voltage was 1.392V to 1.400V, and so that means the Offsets I need to try are 0.0309/0.0359 to 0.0389/0.0439 (1.392 minus 1.3611, 1.392 minus 1.3561, 1.400 minus 1.3611, 1.400 minus 1.3561). It turned out that using +0.040 got me my 1.392-1.400V. Other people with the exact same system, same VID and same desired core voltage could end up needing a different Offset because every system is physically unique.

Therefore, experimentation is necessary.

Also, I should say that if my desired core voltage were LOWER than 1.3611 and 1.3561, then I'd have to use a negative Offset instead of a Positive.
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It's a computer!
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post #5 of 10
About the Internal PLL Overvoltage, I would guess every case is different but I found I didnt need it enabled atleast for 4.8ghz. So I left mine disabled.
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post #6 of 10
Quote:
Originally Posted by BinaryDemon View Post
About the Internal PLL Overvoltage, I would guess every case is different but I found I didnt need it enabled atleast for 4.8ghz. So I left mine disabled.
Indeed. Every system is physically unique!
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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 
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post #7 of 10
Thread Starter 
Thanks for the input TwoCables, I will try some things out and let you know if I fail miserably.
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Crucial RealSSD M4 128GB 2.5" Samsung SpinPoint F3 1TB ASUS DRW-24B3ST Corsair A70 Dual Fan CPU Cooler 
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post #8 of 10
Quote:
Originally Posted by Demarki View Post
Thanks for the input TwoCables, I will try some things out and let you know if I fail miserably.
hehe ok
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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
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
Click this button. If your VID is way lower than what mine is here, then put some load on the CPU.
I see exactly the same VID value as yours, does it mean that there is no room for further voltage increase, or should I still set the offset voltage +0.015 and raise the multiplier to 46 just to see if the system is stable?

Your reply confused me a bit, so I apologize for the question.
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post #10 of 10
Quote:
Originally Posted by Demarki View Post
I see exactly the same VID value as yours, does it mean that there is no room for further voltage increase, or should I still set the offset voltage +0.015 and raise the multiplier to 46 just to see if the system is stable?

Your reply confused me a bit, so I apologize for the question.
It doesn't mean anything except that we have the same VID. So try +0.015 or +0.020. Experiment.
It's a computer!
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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) 
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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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