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Help lower Vcore


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#1 delacruzpaolo21

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Posted 05 September 2013 - 03:03 AM

Hi guys I have a small question
does lowering the CPU PLL helps lower the vcore?

I'm using a turbo oc of 4.4ghz
internal pll overvoltage : disabled
EIST : anabled
intel turbo boost : enabled
enhanced turbo : disabled
XMP : enabled (1866mhz 1.5v)
DRAM timing mode : link
Vdroop offset control : [+50.0%]
digital compensation level : high
CPU PLL voltage : auto
C1E support : enabled
overspeed protection : disabled
intel C-state : enabled
long duration power limit (w) : 200
long duration maintained (s) : 1
short duration power limit (w) : 250

runs stable at prime95 blend test
cpuz reads vcore @ 1.312v full load and 80 degrees max temp
but aida64 extreme reads my cpu vid @ 1.391v

my specs:
intel core i7 2600k
z77 mpower
crucial ballistix elite 16GB (8GBx2)
asus gtx 690
seagate barracuda 2tb
thermaltake TR2 900w

#2 Psywar

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Posted 05 September 2013 - 06:50 AM

Post Moved to Proper Section.


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#3 wevsspot

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Posted 05 September 2013 - 08:07 AM

There is plenty of fairly concrete evidence that lowering the CPU PLL can help eliminate 0x0124 BSOD errors on Sandy Bridge.  Lowering the CPU PLL can also slightly lower cpu core temperatures.  However, beyond anecdotal evidence I've never personally saw anything that would absolutely prove that by lowering CPU PLL you can also lower the cpu core voltage.  Pretty much just trial and error at that point.

 

At any rate, any time you can run voltages lower than nominal and still remain stable - that has to be a good thing for the most part.  I've found on the last three rigs I've built that as long as I stay at a multiplier of 45 or less (Sandy and Ivy) that I can run the CPU PLL voltage anywhere from 1.72v and 1.76v and maintain stability.

 

I've seen some people that are able to run CPU PLL as low as 1.64v and still maintain stability.using a 2500K, 2600K or 2700K.  

 

On my current setup I'm running a 3770K at 4.40Ghz with the CPU PLL at 1.76v with complete stability 24/7.

 

Now bear in mind, that once you start hitting the higher multipliers and higher clock speeds, the inverse can be true and you have to start increasing CPU PLL to maintain stability.


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#4 delacruzpaolo21

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Posted 05 September 2013 - 06:01 PM

thanks for the answer wevsspot It helps.

#5 wevsspot

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Posted 06 September 2013 - 05:22 AM

YW.  And welcome to the OCC forums.

 

For finding your absolute lowest stable CPU PLL;

 

Disable CPU PLL Overvoltage - do not rely on "Auto" and of course if you enable it you are defeating the purpose

 

Start reducing CPU PLL Voltage 0.01v at a time and see if the PC boots.  Continue doing this until the PC wont boot and then add 0.01v back to the CPU PLL Voltage.  Now check stability with OCCT or Prime95.  Continue adding back 0.01v until your system is stable during stress testing


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#6 delacruzpaolo21

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Posted 06 September 2013 - 10:14 PM

I will thanks again :)

#7 delacruzpaolo21

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Posted 10 September 2013 - 08:33 PM

just an update
managed to drop my CPU PLL voltage to 1.5
temp results are great

turbo oc of 4.4ghz
internal pll overvoltage : disabled
EIST : enabled
intel turbo boost : enabled
enhanced turbo : disabled
XMP : enabled (1866mhz 1.5v)
DRAM timing mode : link
Vdroop offset control : [+50.0%]
digital compensation level : high
CPU PLL voltage : 1.5v
C1E support : enabled
overspeed protection : disabled
intel C-state : enabled
long duration power limit (w) : 200
long duration maintained (s) : 1
short duration power limit (w) : 250

runs stable at prime95 blend test
cpuz reads vcore @ 1.312v full load and 80 degrees max temp
but aida64 extreme reads my cpu vid @ 1.391v

thanks again wevsspot :)

#8 wevsspot

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Posted 11 September 2013 - 05:00 AM

Wow, that might be a record  :)

 

Remember, if you have any stability issues be sure and give the CPU PLL voltage a bump.

 

How long did you run Memtest for?  If less than 8 hours, schedule an 8 hour run one night before you go to bed.


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#9 delacruzpaolo21

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Posted 11 September 2013 - 06:28 PM

Wow, that might be a record :)

Remember, if you have any stability issues be sure and give the CPU PLL voltage a bump.

How long did you run Memtest for? If less than 8 hours, schedule an 8 hour run one night before you go to bed.


I haven't run a memtest yet just prime95 blend test for 6 hours, I'll try a large fft for my memory right?

Edited by delacruzpaolo21, 11 September 2013 - 06:29 PM.


#10 delacruzpaolo21

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Posted 11 September 2013 - 11:24 PM

I have another question wevvspot,
my bus speed seems to be a bit higher than the rated bus speed, runs 100.5xx.
I haven't fiddled my bios yet to make it a fix 100 mhz bus speed, my question is if I lower my bus speed to a fix 100mhz will it possibly allow me to lower my vcore?

#11 delacruzpaolo21

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Posted 12 September 2013 - 07:50 PM

Another update, I managed to lower my vcore after setting my bus speed to a fix 100.00mhz
set my cpu pll voltage to 1.6,
1.5 unstable with ibt

turbo oc 4.4ghz
internal pll overvoltage : disabled
EIST : enabled
intel turbo boost : enabled
enhanced turbo : disabled
XMP : enabled (1866mhz 1.5v)
DRAM timing mode : auto
Vdroop offset control : [+37.5%]
digital compensation level : high
CPU PLL voltage : 1.6000
C1E support : enabled
overspeed protection : disabled
intel C-state : enabled
long duration power limit (w) : 200
long duration maintained (s) : 3
short duration power limit (w) : 250

runs stable at prime95 blend test & ibt
cpuz reads vcore @ 1.296v full load and 80 degrees max temp
aida64 extreme reads my cpu vid @ 1.391v

#12 wevsspot

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Posted 13 September 2013 - 09:44 AM

Congrats.  

 

It's not unusual for the "Auto" bus speed to be a little over exactly 100Mhz.  Many overclockers will do exactly as you did and hard set it to 100Mhz.  No harm there.


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