Need help with voltage terms

Schotzy · 08-12-2009, 01:12 PM

Could someone explain what these are; they are all listed under CPU voltage. ( I will list each setting and it's current voltage.)

Load line calibration ( it's currently disabled)
CPU vcore- 1.2375 volts
CPU termination- 1.2 volts
CPU PLL-1.5 volts
CPU reference- .760 volts

Could someone explain what these are and tell me which one I need to increase?
I'm sorry but I'm pretty new at this and I can't find a guide to explain the voltage options.

I have a Intel q9550 and a Gigabyte EP45-UD3P motherboard.

**greenbrucelee** · 08-13-2009, 05:20 AM

The CPU core voltage (VCORE) is the power supply voltage supplied to the CPU (which is a digital circuit), GPU, or other device containing a processing core

CPU PLL Voltage - Selecting a higher PLL (phase lock-loop) voltage may help the installed CPU clock higher.

I think cpu termination is where you set it to cut off after the volts get too much

I have never changed the cpu pll and cpu termination, I have them on auto

Schotzy · 08-13-2009, 08:45 AM

Thanks for the help for the help. I'm trying to overclock my q9550 and it won't boot past 3 ghz. What setting do I increase to up the voltage? Is there more than one?

**greenbrucelee** · 08-13-2009, 11:56 AM

Yes there will be more than one setting, yours will probably be set on Auto at the moment.

On my motherboards BIOS I go down to the cpu voltage and press enter and it allows me to select from a list try this an if its the same as mine just select the next one up and see if it boots.

Schotzy · 08-13-2009, 09:55 PM

Do I change the CPU vcore? What voltage is normal and what is dangerous for a quad cre CPU?

**Aus_Karlos** · 08-14-2009, 01:36 AM

1.35v is the max for those Quad cores so you could try bumping it upto 1.3v and see if it boots.
CPU PLL i think (dont quote me) can go upto a max 1.8v. But many people can leave this on 1.5v
Leave the reference on default has it has more to do with data or address signals from the CPU to the CPUs on-board memory. If you have CPU GTL leave is on default as well. CPU ref and CPU GTL must be with a certain Ratio of each other.

CPU termination is also known as FSB voltage, you dont need to tweak this much probably wont need to go to over 1.3v

@greenbrucelee

When overclocking its wise never to leave anything on AUTO. Ive done this mistake a few times. The BIOS will try and decide what is the best stable voltage for the current clock. Once i left my CPU on AUTO just to see what the BIOS does. I had set my Vcore to 1.3v, when i selected AUTO it decided that 1.5v is fine. When in fact it could of killed my CPU. If you don't want to change a particular voltage then set it to Normal.

**greenbrucelee** · 08-15-2009, 05:25 AM

Quote:

Originally Posted by Aus_Karlos

1.35v is the max for those Quad cores so you could try bumping it upto 1.3v and see if it boots.
CPU PLL i think (dont quote me) can go upto a max 1.8v. But many people can leave this on 1.5v
Leave the reference on default has it has more to do with data or address signals from the CPU to the CPUs on-board memory. If you have CPU GTL leave is on default as well. CPU ref and CPU GTL must be with a certain Ratio of each other.

CPU termination is also known as FSB voltage, you dont need to tweak this much probably wont need to go to over 1.3v

@greenbrucelee

When overclocking its wise never to leave anything on AUTO. Ive done this mistake a few times. The BIOS will try and decide what is the best stable voltage for the current clock. Once i left my CPU on AUTO just to see what the BIOS does. I had set my Vcore to 1.3v, when i selected AUTO it decided that 1.5v is fine. When in fact it could of killed my CPU. If you don't want to change a particular voltage then set it to Normal.

Yes I realise this, I was just explaining to shotzy that his vcore is probably on auto meaning that it would be better if he changed it.

**Aus_Karlos** · 08-16-2009, 12:57 AM

Forgot to mention, when getting to a high level of OC, +700mhz over its best to enable LLC (Load-Line Calibration). What this does is compensate for the volt-drop or vdroop when the CPU is under load. You will notice that if you set your voltage to say 1.3v and put your system under load it may drop to 1.27v. LLC tries to keep the voltage closer to 1.3v under load, this can really help with stability.

08-12-2009, 01:12 PM	#1 (permalink)
Schotzy Registered User Join Date: Jan 2009 Posts: 58 OS: xp	Need help with voltage terms Could someone explain what these are; they are all listed under CPU voltage. ( I will list each setting and it's current voltage.) Load line calibration ( it's currently disabled) CPU vcore- 1.2375 volts CPU termination- 1.2 volts CPU PLL-1.5 volts CPU reference- .760 volts Could someone explain what these are and tell me which one I need to increase? I'm sorry but I'm pretty new at this and I can't find a guide to explain the voltage options. I have a Intel q9550 and a Gigabyte EP45-UD3P motherboard.

08-13-2009, 05:20 AM	#2 (permalink)
greenbrucelee Mentor Hardware team Join Date: Apr 2007 Posts: 1,789 OS: XP SP3 My System	Re: Need help with voltage terms The CPU core voltage (VCORE) is the power supply voltage supplied to the CPU (which is a digital circuit), GPU, or other device containing a processing core CPU PLL Voltage - Selecting a higher PLL (phase lock-loop) voltage may help the installed CPU clock higher. I think cpu termination is where you set it to cut off after the volts get too much I have never changed the cpu pll and cpu termination, I have them on auto __________________ Microsoft certified professional, Network +, A+ certified Last edited by greenbrucelee; 08-13-2009 at 05:25 AM.

08-13-2009, 08:45 AM	#3 (permalink)
Schotzy Registered User Join Date: Jan 2009 Posts: 58 OS: xp	Re: Need help with voltage terms Thanks for the help for the help. I'm trying to overclock my q9550 and it won't boot past 3 ghz. What setting do I increase to up the voltage? Is there more than one?

08-13-2009, 11:56 AM	#4 (permalink)
greenbrucelee Mentor Hardware team Join Date: Apr 2007 Posts: 1,789 OS: XP SP3 My System	Re: Need help with voltage terms Yes there will be more than one setting, yours will probably be set on Auto at the moment. On my motherboards BIOS I go down to the cpu voltage and press enter and it allows me to select from a list try this an if its the same as mine just select the next one up and see if it boots. __________________ Microsoft certified professional, Network +, A+ certified

08-13-2009, 09:55 PM	#5 (permalink)
Schotzy Registered User Join Date: Jan 2009 Posts: 58 OS: xp	Re: Need help with voltage terms Do I change the CPU vcore? What voltage is normal and what is dangerous for a quad cre CPU?

08-14-2009, 01:36 AM	#6 (permalink)
Aus_Karlos Moderator, Games Team Join Date: Mar 2007 Location: Western Australia Posts: 3,427 OS: Vista Ultimate x64, Windows XP 32-bit/64-bit, Ubuntu x64, Windows 7 x64 Beta My System Blog Entries: 2	Re: Need help with voltage terms 1.35v is the max for those Quad cores so you could try bumping it upto 1.3v and see if it boots. CPU PLL i think (dont quote me) can go upto a max 1.8v. But many people can leave this on 1.5v Leave the reference on default has it has more to do with data or address signals from the CPU to the CPUs on-board memory. If you have CPU GTL leave is on default as well. CPU ref and CPU GTL must be with a certain Ratio of each other. CPU termination is also known as FSB voltage, you dont need to tweak this much probably wont need to go to over 1.3v @greenbrucelee When overclocking its wise never to leave anything on AUTO. Ive done this mistake a few times. The BIOS will try and decide what is the best stable voltage for the current clock. Once i left my CPU on AUTO just to see what the BIOS does. I had set my Vcore to 1.3v, when i selected AUTO it decided that 1.5v is fine. When in fact it could of killed my CPU. If you don't want to change a particular voltage then set it to Normal. __________________ MemTest86 / Nvidia Drivers / ATI Drivers / DirectX 9.0c / Sys Requirements / Everest Folding@Home

08-16-2009, 12:57 AM	#8 (permalink)
Aus_Karlos Moderator, Games Team Join Date: Mar 2007 Location: Western Australia Posts: 3,427 OS: Vista Ultimate x64, Windows XP 32-bit/64-bit, Ubuntu x64, Windows 7 x64 Beta My System Blog Entries: 2	Re: Need help with voltage terms Forgot to mention, when getting to a high level of OC, +700mhz over its best to enable LLC (Load-Line Calibration). What this does is compensate for the volt-drop or vdroop when the CPU is under load. You will notice that if you set your voltage to say 1.3v and put your system under load it may drop to 1.27v. LLC tries to keep the voltage closer to 1.3v under load, this can really help with stability. __________________ MemTest86 / Nvidia Drivers / ATI Drivers / DirectX 9.0c / Sys Requirements / Everest Folding@Home