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Undervolting Sandy Bridge CPUs - i7 2600k, etc

post #1 of 19
Thread Starter 
Anyone undervolt at stock or undervolt + overclock their Sandy Bridge?

What is the lowest stable voltage they got with their Sandy Bridge (especially i5 2500/2500k, i7 2600/2600k, 2700, etc).

I'm currently experimenting with undervolting my i7 2600k. I've had it at 1.05v stable at Prime95 FFT for 6+ hours. Currently running it at 1.025v (goes down to 1.008v at load) with Prime95 FFT at 3 hours and counting. Is this normal?

What has other folks here got with their Sandy Bridge undervolting?
Edited by Bluescreendeath - 2/2/16 at 3:55pm
post #2 of 19
I've got my 3820 to 1.17v at 4.3GHz, which is an under volt and an overclock on the stock 1.23v

So the answer is yes, I'm sure you might be able to go under 1v if your chip is of very good quality. What clock speed are you at?
     
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post #3 of 19
Thread Starter 
I'm running it at stock clocks at 3.4 with turbobat 3.8
post #4 of 19
50 passes of IBT and 20 mins of P95 is enough to "assume" its stable and try to lower it further. For a finaltest, 100 passes of IBT on the highest and 4+ hours of P95 is sufficient.
     
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post #5 of 19
Thread Starter 
Quote:
Originally Posted by PedroC1999 View Post

50 passes of IBT and 20 mins of P95 is enough to "assume" its stable and try to lower it further. For a finaltest, 100 passes of IBT on the highest and 4+ hours of P95 is sufficient.

IBT = intel burn test? Do you use Prime95 small FFT or blend?
post #6 of 19
Yes IntelBurnTest

Small FFT stresses the CPU the most so yes
     
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WD Caviar Blue 1tb 7200RPM WD Caviar Blue 1tb 7200RPM WD Caviar Blue 500gb 7200RPM 120.5 Custom Loop 
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post #7 of 19
Thread Starter 
So far, I'm Prime95 Small FFT stable for 3+ hours with voltage at 1.020v-1.025v - with v drop, it goes down to 1.008v at load. When I drop it down to 1.010v (which goes below 1.0v with v drop at load), Prime95 picks up errors in core #2, and the PC crashes within an hour.
post #8 of 19
You got 1 more step, and that's 1.015, that should vDroop to 1.001, try that next!
     
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Intel Core i7 3820 @ 4.5Ghz ASUS Rampage IV Formula X79 EVGA GTX 980 Ti Hybrid @ 1450/1900 Corsair Dominator 16gb @ 2.2GHz C9 
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WD Caviar Blue 1tb 7200RPM WD Caviar Blue 1tb 7200RPM WD Caviar Blue 500gb 7200RPM 120.5 Custom Loop 
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NZXT Switch 810 Black (Heavily Modded) Logitech G502 Proteus Spectrum Sennheiser HD 598 Cs 
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AMD FX-6300 @ 4.5Ghz Gigabyte 970A UD3 AMD HD8490 (OEM) @ 1.1Ghz Core/Mem Patriot Viper Xtreme 8gb @1600MHz 8-8-8-24 
Optical DriveCoolingCoolingOS
LiteOn Bluray Player Corsair Hydro Series H100i Zalman 120mm Led Fans x4 Windows 10 Pro x64 
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CPUMotherboardGraphicsRAM
Intel Core i7 3820 @ 4.5Ghz ASUS Rampage IV Formula X79 EVGA GTX 980 Ti Hybrid @ 1450/1900 Corsair Dominator 16gb @ 2.2GHz C9 
Hard DriveHard DriveHard DriveCooling
WD Caviar Blue 1tb 7200RPM WD Caviar Blue 1tb 7200RPM WD Caviar Blue 500gb 7200RPM 120.5 Custom Loop 
OSMonitorKeyboardPower
Windows 10 Pro x64 LG D2343P-BN 3D Monitor @ 70Hz Corsair K70 (MX Brown) Corsair AX Series 850w 
CaseMouseAudio
NZXT Switch 810 Black (Heavily Modded) Logitech G502 Proteus Spectrum Sennheiser HD 598 Cs 
CPUMotherboardGraphicsRAM
AMD FX-6300 @ 4.5Ghz Gigabyte 970A UD3 AMD HD8490 (OEM) @ 1.1Ghz Core/Mem Patriot Viper Xtreme 8gb @1600MHz 8-8-8-24 
Optical DriveCoolingCoolingOS
LiteOn Bluray Player Corsair Hydro Series H100i Zalman 120mm Led Fans x4 Windows 10 Pro x64 
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Hitachi 24" 70Hz Monitor Logitech EX110 OCZ ZT 550w Full Modular Zalman Z9 Plus 
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post #9 of 19
Thread Starter 
I brought voltage down to 1.015v, ran Prime95 and watched vdroop go down to an amazing flat 1.000v - wooot! biggrin.gif Then it crashed about 30 minutes later. frown.gif

I guess 1.020v is the lowest I can go at stock settings....or so I thought. I ran it again with Prime95, and after a few hours, core #2 started having problems and had 1 error. Time to bring up the voltage again I suppose...
Edited by Bluescreendeath - 2/4/16 at 5:30pm
post #10 of 19
May I ask, why are you downvolting? Any particular reason or just testing it out?
     
CPUMotherboardGraphicsRAM
Intel Core i7 3820 @ 4.5Ghz ASUS Rampage IV Formula X79 EVGA GTX 980 Ti Hybrid @ 1450/1900 Corsair Dominator 16gb @ 2.2GHz C9 
Hard DriveHard DriveHard DriveCooling
WD Caviar Blue 1tb 7200RPM WD Caviar Blue 1tb 7200RPM WD Caviar Blue 500gb 7200RPM 120.5 Custom Loop 
OSMonitorKeyboardPower
Windows 10 Pro x64 LG D2343P-BN 3D Monitor @ 70Hz Corsair K70 (MX Brown) Corsair AX Series 850w 
CaseMouseAudio
NZXT Switch 810 Black (Heavily Modded) Logitech G502 Proteus Spectrum Sennheiser HD 598 Cs 
CPUMotherboardGraphicsRAM
AMD FX-6300 @ 4.5Ghz Gigabyte 970A UD3 AMD HD8490 (OEM) @ 1.1Ghz Core/Mem Patriot Viper Xtreme 8gb @1600MHz 8-8-8-24 
Optical DriveCoolingCoolingOS
LiteOn Bluray Player Corsair Hydro Series H100i Zalman 120mm Led Fans x4 Windows 10 Pro x64 
MonitorKeyboardPowerCase
Hitachi 24" 70Hz Monitor Logitech EX110 OCZ ZT 550w Full Modular Zalman Z9 Plus 
MouseAudioOther
DELL Wireless Mouse Logitech 5.1 Sound System TP-Link TL-WN781ND Wireless Card 
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CPUMotherboardGraphicsRAM
Intel Core i7 3820 @ 4.5Ghz ASUS Rampage IV Formula X79 EVGA GTX 980 Ti Hybrid @ 1450/1900 Corsair Dominator 16gb @ 2.2GHz C9 
Hard DriveHard DriveHard DriveCooling
WD Caviar Blue 1tb 7200RPM WD Caviar Blue 1tb 7200RPM WD Caviar Blue 500gb 7200RPM 120.5 Custom Loop 
OSMonitorKeyboardPower
Windows 10 Pro x64 LG D2343P-BN 3D Monitor @ 70Hz Corsair K70 (MX Brown) Corsair AX Series 850w 
CaseMouseAudio
NZXT Switch 810 Black (Heavily Modded) Logitech G502 Proteus Spectrum Sennheiser HD 598 Cs 
CPUMotherboardGraphicsRAM
AMD FX-6300 @ 4.5Ghz Gigabyte 970A UD3 AMD HD8490 (OEM) @ 1.1Ghz Core/Mem Patriot Viper Xtreme 8gb @1600MHz 8-8-8-24 
Optical DriveCoolingCoolingOS
LiteOn Bluray Player Corsair Hydro Series H100i Zalman 120mm Led Fans x4 Windows 10 Pro x64 
MonitorKeyboardPowerCase
Hitachi 24" 70Hz Monitor Logitech EX110 OCZ ZT 550w Full Modular Zalman Z9 Plus 
MouseAudioOther
DELL Wireless Mouse Logitech 5.1 Sound System TP-Link TL-WN781ND Wireless Card 
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