Sandy Bridge Pll Overvoltage

LtMatt

LtMatt

LtMatt

Caporegime
Joined
12 Jul 2007
Posts
45,135
Location
United Kingdom
What is everyone running for Pll overvoltage?

I have been having some odd experiences with this voltage.

Default is 1.7? Well if i leave over voltage disabled it defaults to 1.7 on my board.

Windows will not boot with it disabled. I enable it and it remains at 1.7 unless i change it manually. Once enabled windows will boot despite it being the exact same voltage as when disabled.

Once its enabled i have been able to lower it to 1.5v so far without any changes in stability. Windows still boots fine so long as in bios it shows as enabled @1.5v.

My 2500k is @4.7ghz. With 4.6ghz i can leave it disabled and at default voltage of 1.7 fine, however going up to 4.7ghz requires it to be enabled as i mentioned above or windows hangs on boot every time.
 
Yea good info Matt i might try lower mine to see if temps drop and still stable. I just followed that guide and kinda stuck with it. (but i'm all for cooler running components :D) Thanks for this :)
 
MyBrains said:
Yea good info Matt i might try lower mine to see if temps drop and still stable. I just followed that guide and kinda stuck with it. (but i'm all for cooler running components :D) Thanks for this :)
Click to expand...

Its worth a try, no idea if it will work for everyone though. Makes almost no sense to me based on what i wrote in the OP.
 
Well it'd be nice to bring the temps down a bit as im currently working on my CPU cooling setup with looking at a better fan for my Zalman cooler. I started a thread in the cooling forum as im looking for a good 120mm fan.
 
MyBrains said:
Well it'd be nice to bring the temps down a bit as im currently working on my CPU cooling setup with looking at a better fan for my Zalman cooler. I started a thread in the cooling forum as im looking for a good 120mm fan.
Click to expand...

I'm using a pair of these on my H60.

http://www.overclockers.co.uk/showproduct.php?prodid=FG-008-CS&groupid=701&catid=2331&subcat=4

Brought temps down considerably.

1.4 volts - 4.7ghz - During gaming and everyday use temps around 62-68c depending on room temp.
 
Maybe i need to try that with my Zalman Z9 fan controller. Anyway i need to hit the bank and transfer some cash as i need to buy something from OCuK and they only have one left in stock :eek:

Back later :)
 
Set my PLL to 1.6v (was 1.8v) and it seems pretty stable atm and ran half hour prime stable @ 4.6GHz. Max temps was 63 68 67 65 on my £35 Zalman quiet cooler :)
 
MyBrains said:
Set my PLL to 1.6v (was 1.8v) and it seems pretty stable atm and ran half hour prime stable @ 4.6GHz. Max temps was 63 68 67 65 on my £35 Zalman quiet cooler :)
Click to expand...

Great news, shame no one else has come forward to share their experiences.
 
MyBrains said:
My 2700K is 1.8v and i got my tips from this thread here..

http://forums.overclockers.co.uk/showthread.php?t=18340310

I made a few slight changes but still auto volts (1.35v max) @ 4.6GHz stable.
Click to expand...

I just read that guide, not sure i agree with all of that tbh.

Why would you want all the energy saving features off? The best thing about sandybridge is all you need to change is the offset voltage, LLC level and the turbo multiplier. Doing that i can run up to 4.7ghz, not tried for further but im sure its possible.
 
2500k @ 4.8ghz, stressed tested at 4.9ghz for over 7hours++ on Asus P8P67pro

CPU PLL is down-clocked to 1.55v
VCCIO 1.0v
VCCSA stock? (.925)
CPU Spread spectrum off (must have for me to be stable)
Internal PLL overvoltage enabled

Ram 4*2gb corsair XMS running 1.425v (again reduced from 1.65v) at 1666, 9,9,924 1T
 
You must log in or register to reply here.
Back
Top Bottom