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Reset to stock speed over 3.2GHz OC?

post #1 of 14
Thread Starter 
Hi, I'm very new to overclocking, so I'm not sure why this happens, but I'm just curious.

When I OC my Quad-core Q8400, I'm able to reach 3.2GHz easily, but as soon as I give it the tiniest bump in speed (from my BIOS), my computer decides that it should run at 2.66GHz (the stock speed). Is this a voltage problem? A motherboard issue? Something like that?

Here's a screenshot of Core Temp under stress:


And here's CPU-Z:


I'm not really in much of a rush to stress my CPU any more than to 3.2GHz, but I am curious as to what the problem is, just for knowledge's sake and future reference.

Thanks in advance!
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post #2 of 14
Quote:
Originally Posted by 5outh View Post
Hi, I'm very new to overclocking, so I'm not sure why this happens, but I'm just curious.

When I OC my Quad-core Q8400, I'm able to reach 3.2GHz easily, but as soon as I give it the tiniest bump in speed (from my BIOS), my computer decides that it should run at 2.66GHz (the stock speed). Is this a voltage problem? A motherboard issue? Something like that?

Here's a screenshot of Core Temp under stress:


And here's CPU-Z:


I'm not really in much of a rush to stress my CPU any more than to 3.2GHz, but I am curious as to what the problem is, just for knowledge's sake and future reference.

Thanks in advance!
I guess it fails to boot at the new freq and BIOS resets stock settings automatically. Mine asks first.
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post #3 of 14
maybe you have speed step on in the bios and it downclocks when you are idle.
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post #4 of 14
It is probably a lack of core voltage because 1.232V is pretty low.

Or, it could be that Raidmax PSU.
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by Karol3 View Post
maybe you have speed step on in the bios and it downclocks when you are idle.
Nah, I've checked. I know that it does this; I have to stress my CPU to get it to run at 3.2GHz, that's why I ran Prime95 while taking those screenshots.
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
It is probably a lack of core voltage because 1.232V is pretty low.

Or, it could be that Raidmax PSU.
Could the PSU really have something to do with it? ><
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post #7 of 14
Quote:
Originally Posted by 5outh View Post
Nah, I've checked. I know that it does this; I have to stress my CPU to get it to run at 3.2GHz, that's why I ran Prime95 while taking those screenshots.
EIST or C1E would not cause this to happen because what you are experiencing is not what these two power-saving features do.
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It's a computer!
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post #8 of 14
Quote:
Originally Posted by 5outh View Post
Could the PSU really have something to do with it? ><
Yes, but raise the vCore first. 1.232V is low.
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It's a computer!
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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 #9 of 14
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
Yes, but raise the vCore first. 1.232V is low.
Alright, thanks. I'll give that a shot.
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post #10 of 14
Quote:
Originally Posted by 5outh View Post
Alright, thanks. I'll give that a shot.
What are you using for CPU cooling?
It's a computer!
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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 
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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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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