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3770k Vcore dropping under load with VDroop set to 100%

post #1 of 6
Thread Starter 
Hey Guys, I have a 3770k that I have been trying to get stable for a long time at 4.8Ghz. I get an idle Vcore of 1.480v in CPU-Z but in the BIOS, it shows 1.53v. I have VDroop enabled at 100% but my Vcore actually goes down to about 1.43-1.42v which causes the computer to fail Prime 95 and IBT. I have Power Technology set to Custom, because otherwise, the overclock will not register in either the BIOS or CPU-Z. My motherboard is a P67A-GD55 running BIOS version 4.1. All Intel C States are disabled. Thanks for the help guys.
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Intel Core i7-3770k 4.8Ghz MSI P67A-GD55 (B3) Sapphire Radeon R9 290x Kingston HyperX 3X4GB DDR3-1333 1.65v 
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Kyle's FSX PC
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Intel Core i7-3770k 4.8Ghz MSI P67A-GD55 (B3) Sapphire Radeon R9 290x Kingston HyperX 3X4GB DDR3-1333 1.65v 
Hard DriveHard DriveOptical DriveCooling
Intel 330 SSD 180GB Western Digital Black 500GB LG Super Multi 32X DVD Burner NH-D14 
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post #2 of 6

So then set the voltage higher in the BIOS. That's all you can do at this point in order to have your full-load voltage end up being high enough in order to  achieve stability.

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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) 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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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG 
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 6
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

So then set the voltage higher in the BIOS. That's all you can do at this point in order to have your full-load voltage end up being high enough in order to  achieve stability.
Ya, that's what I figured. I just found it weird that my Vcore was dropping that low under stress. I need 1.45v for 4.8ghz, so I need to set it about 1.5v or 1.51v to achieve stability. Just seemed odd to me. Thank you for the response.
Kyle's FSX PC
(12 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770k 4.8Ghz MSI P67A-GD55 (B3) Sapphire Radeon R9 290x Kingston HyperX 3X4GB DDR3-1333 1.65v 
Hard DriveHard DriveOptical DriveCooling
Intel 330 SSD 180GB Western Digital Black 500GB LG Super Multi 32X DVD Burner NH-D14 
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Kyle's FSX PC
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CPUMotherboardGraphicsRAM
Intel Core i7-3770k 4.8Ghz MSI P67A-GD55 (B3) Sapphire Radeon R9 290x Kingston HyperX 3X4GB DDR3-1333 1.65v 
Hard DriveHard DriveOptical DriveCooling
Intel 330 SSD 180GB Western Digital Black 500GB LG Super Multi 32X DVD Burner NH-D14 
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post #4 of 6
Quote:
Originally Posted by KyGuy View Post


Ya, that's what I figured. I just found it weird that my Vcore was dropping that low under stress. I need 1.45v for 4.8ghz, so I need to set it about 1.5v or 1.51v to achieve stability. Just seemed odd to me. Thank you for the response.

 

You're welcome.

 

It sounds to me that this motherboard doesn't have a very good VRM, or whatever is used for vDroop control.

It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) 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 
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 (1.400-1.424V in Manual Mode) 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 
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
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

You're welcome.

It sounds to me that this motherboard doesn't have a very good VRM, or whatever is used for vDroop control.
Ya, there have been a lot of complaints of about the P67A-GD55 boards and Vdroop. It doesn't have a specific LLC setting in the BIOS, so that could be part of the problem.
Kyle's FSX PC
(12 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770k 4.8Ghz MSI P67A-GD55 (B3) Sapphire Radeon R9 290x Kingston HyperX 3X4GB DDR3-1333 1.65v 
Hard DriveHard DriveOptical DriveCooling
Intel 330 SSD 180GB Western Digital Black 500GB LG Super Multi 32X DVD Burner NH-D14 
OSMonitorPowerCase
Windows 7 Home Premium 64 Bit Acer 23 inch LCD 1920X1080 Antec HCG 620W Antec 300 Illusion 2 
  hide details  
Reply
Kyle's FSX PC
(12 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770k 4.8Ghz MSI P67A-GD55 (B3) Sapphire Radeon R9 290x Kingston HyperX 3X4GB DDR3-1333 1.65v 
Hard DriveHard DriveOptical DriveCooling
Intel 330 SSD 180GB Western Digital Black 500GB LG Super Multi 32X DVD Burner NH-D14 
OSMonitorPowerCase
Windows 7 Home Premium 64 Bit Acer 23 inch LCD 1920X1080 Antec HCG 620W Antec 300 Illusion 2 
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Reply
post #6 of 6
Quote:
Originally Posted by KyGuy View Post

Ya, there have been a lot of complaints of about the P67A-GD55 boards and Vdroop. It doesn't have a specific LLC setting in the BIOS, so that could be part of the problem.

The MSI boards do LLC a bit differently, where 100% is minimum vdroop & decreasing the % increases the vdroop. Vdroop offest control is similar to LLC on other boards.
Some boards do have LLC setting that let the load voltage go higher than the idle voltage, although even when using those I usually leave a bit of vdroop or at most load voltage = idle voltage.

Just have to up the vcore a bit more to get the load voltage needed. Whatever the LLC settings are the cpu needs the load voltage it needs, some vdroop is actually a good thing when near the maximum 'safe' voltage.
    
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