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The bajillionth thread on overclocking an i5 2500K

post #1 of 8
Thread Starter 
Hi everyone

Okay so firstly, here are my relevant specs:

CPU: i5 2500K
CPU cooler: CM Nepton 240M
Mobo: Gigabyte Z77-D3H
PSU: CM Silent Pro M700

I've recently decided to overclock my 2500K with the hardware listed above but being new to all of this, I'm needing some help. After reading up on what to do when OCing your CPU, I've seen that you need to change the CPU mutliplier, vcore, etc. values in the bios and test for stability using IBT/Prime95, monitoring temps and so on, making appropriate adjustments where necessary. However, when changing my multiplier in my bios from 33 to 42 (or even 40), I find that my system properties and even CPU-Z show a frequency of 5.90GHz and THIS is what has me scratching my head in confusion. I was hoping someone might be able to point out some obvious detail that I might be overlooking?

This is what I am seeing after changing the multiplier in my bios:
post #2 of 8

Yeah, that's Windows for ya: it has no clue, even to this day in Windows 10! I will never understand why they don't just make it read the CPU correctly when it's overclocked. It's stupid because I mean, how hard can it be?

 

Anyway, just go by what CPU-Z says (and other similar overclocker-friendly utilities).


Edited by TwoCables - 10/16/15 at 11:10am
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(19 items)
 
  
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 
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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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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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It's a computer!
(19 items)
 
  
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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post #3 of 8
Thread Starter 
I've seen similar issues to mine like over here https://www.reddit.com/r/overclocking/comments/1txelq/weird_cpu_issue_after_overclocking_i5_2500k/ and still I'm not entirely convinced it's a windows problem thinking.gif. When running IBT, I had my task manager open as well just to monitor the CPU frequency along with CPU-Z. Basically, I saw the frequency shoot up to 8GHz on task manager and I'm not even sure if that's entirely possible. Of course at those frequencies I got a BSOD with a "CLOCK_WATCHDOG_TIMEOUT" error. Needless to say, I've put OCing my CPU on hold until I get help.
post #4 of 8
Quote:
Originally Posted by Zoidberg ZA View Post

I've seen similar issues to mine like over here https://www.reddit.com/r/overclocking/comments/1txelq/weird_cpu_issue_after_overclocking_i5_2500k/ and still I'm not entirely convinced it's a windows problem thinking.gif. When running IBT, I had my task manager open as well just to monitor the CPU frequency along with CPU-Z. Basically, I saw the frequency shoot up to 8GHz on task manager and I'm not even sure if that's entirely possible. Of course at those frequencies I got a BSOD with a "CLOCK_WATCHDOG_TIMEOUT" error. Needless to say, I've put OCing my CPU on hold until I get help.

 

Windows has never been able to correctly read all CPUs when they're overclocked. It can for some, but not for all. For some reason, I've never seen it happen to my computer, but I've seen it more than enough here on Overclock.net that I know it's just Windows being Windows.

 

To be honest in regards to seeing "CLOCK_WATCHDOG_TIMEOUT" while running IBT, I would bet that your system just isn't stable. What was your core voltage and your clock speed according to CPU-Z when you ran IBT?

It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Windows has never been able to correctly read all CPUs when they're overclocked. It can for some, but not for all. For some reason, I've never seen it happen to my computer, but I've seen it more than enough here on Overclock.net that I know it's just Windows being Windows.

To be honest in regards to seeing "CLOCK_WATCHDOG_TIMEOUT" while running IBT, I would bet that your system just isn't stable. What was your core voltage and your clock speed according to CPU-Z when you ran IBT?

According to CPU-Z my core speed was 4.2GHz as I had set, but that doesn't match up with my system BSOD-ing at that known-to-be-safe frequency. As for my core voltage, I had that set on auto - I know the recommended upper limit is something like 1.35? Should I try setting to that? Honestly, I've left most of the setting at auto for fear of making the incorrect changes worriedsmiley.gif
post #6 of 8
hmmm been at 4.8ghz for over 2 years now. i had tha t clock bsod error before, but then i tried offset voltage instead of manual and it worked better
    
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post #7 of 8
Quote:
Originally Posted by Zoidberg ZA View Post


According to CPU-Z my core speed was 4.2GHz as I had set, but that doesn't match up with my system BSOD-ing at that known-to-be-safe frequency. As for my core voltage, I had that set on auto - I know the recommended upper limit is something like 1.35? Should I try setting to that? Honestly, I've left most of the setting at auto for fear of making the incorrect changes worriedsmiley.gif

 

Using Auto might the problem. Auto is best suited for stock. So use manual. We can switch to Offset later, but let's keep it simple for now.

 

The claimed limit of 1.35V is a little bit of healthy paranoia. There are people who have had their 2500K at over 1.4V (as displayed by CPU-Z while running Prime95) with very high overclocks ever since their 2500K was new and they're still not experiencing any problems. However, if you were to do that while keeping a full load on your CPU 24/7 for several months, then you'd begin to see some degradation. Just normal use and gaming though won't do it.

 

So yeah, set the voltage high (like 1.35V, since that should be way higher than is needed for 4.2 GHz) and work your way down until you experience a problem. Then bump it back up to the last tested voltage and then test your system's stability with Prime95 (version 27.7 or newer). If you want a good test of your system's stability in Prime95, then choose "Custom" when you open it and then in the field for how much memory to use, enter around 80 to 85% of your memory. You don't have to be precise, but 80% of 8 GB is exactly 6,553.6 MB, but decimals aren't accepted in that field. 85% is 6,963.2 MB. So really, like anything from 6500 to 7000 MB would work very well. Don't go much higher because then it begins being less and less effective as a test of your system's stability.

 

Now that you are here on Overclock.net, you no longer have anything to fear. You can just ask us before making any changes.


Edited by TwoCables - 10/18/15 at 8:15am
It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #8 of 8
Thread Starter 
Thanks for the replies guys. I'll give it another go this week and will post back over the weekend with an update.
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