A question about overclocking a 2600k if you would be so kind...

[cabbio540]

Hi Guys,

I am a bit new to overclocking and have a couple of questions about overclocking a 2600k on a Asus P8Z68-V PRO motherboard. I have managed to overclock my 2600k to 4.6Ghz (2 Hours prime stable, 20 passes on LinX 0.6.4, many hours of games and general use) at 1.36V, reaching max temperatures of about 71, usually its around the 65 mark.

I am going to try to get it stable at lower voltages, but havn't got round to it yet, as I'm still early on in the process.

Is there anyway to make it so the cpu Voltage is dropped when the processor is idle (to reduce the temps) if the voltage is manually set in the UEFI Interface? At the moment my CPU sits at around 42°C which is a little hot? At stock speeds it sits at low 30's. I'm using a H60 cooler.

I know if you set the CPU voltage to auto it will do this, but then when it ramps it up to 100% load it sends the voltage way pass the 1.4v mark (which I dont really want to do due to the impact of the lifespan on the processor).

Or would you recommend gradually lowering the voltage until it becomes unstable to find the perfect voltage, and seeing what the temps are like then? I am going to try 8 hours prime tonight to see if its fully stable.

Screenshot below:

Thanks for your help,

Simon

 

[cabbio540]

Ok Sorry Guys, with a little more digging I realise this is the Offset mode on the CPU Voltage setting.

I'm guessing that say my CPU Voltage is 1.4v stressed setting a CPU offset of -0.1v would take it down to 1.3v stressed, effectively set a maximum voltage of 1.3v for when the CPU is stressed? After doing a bit of research I see that it does it to your idle voltage as well.

Does anyone have any quick guides as to what to set it to? Do you guys recommend using it or do you stick to the manual (fixed voltage), or do you leave it on auto? When left on auto my temps go quite high (high 70's) and the voltage goes up to 1.43v. Maybe I am being a bit ambitious with my overclock and should try and set it lower?

Thanks for your help, sorry to spam up the boards, you guys must get 10 of these a day....

 

[!TIMMY!]

Personally I like to set it manually when overclocking. Then I know the motherboard isn't going to overvolt the CPU and slowly damage it over time. I think I remember reading that if you set it manually then it won't drop down when the speed drops to 1.6GHz and looking at mine right now it's staying around 1.3v. Clunks website has a nice guide for the ASUS P67 and the i2600K.

 

[pgi947]

Its never going to overvolt it under offset if you do your math. Your offset deducts or adds from your VID not vcore. Open core temp, find your VID under load at the desired clock speed (VID changes automatically depending on clock speed) then +/- to reach your desired voltage. The VID will also drop when speed step kicks in, and your offset will +/- from that VID too. A typical speedstep reduced speed voltage is around 0.9-1.0v.

Example, my 4.8ghz VID is 1.372v, I set an offset of -0.060v to reach a voltage of 1.312v. 1.372 - 0.06 = 1.312

+1 for clunks guide for asus p67/z68 overclocking guide.

 

[astar0]

I have a similar question regarding 2500k and P8Z68-V.

The VID on mine at 4.4ghz is 1.3611 but CPU-Z only shows 1.304 volts being used. This is only stable for 2 hours of Prime95 then core 2 fails.

In the bios I currently have CPU Voltage on AUTO and Offset + on AUTO. How do I up the volts to try get this completely stable? I tried setting Offset to 0.05 which in CPU-Z looked like it had added .05 volts but it crashed instantly when starting Prime95.

What am I doing wrong? And why is the VID different to the cpu volts on CPU-Z?

Any help would be greatly appreciated.

 

[cabbio540]

Cheers for the help guys. I am going to read up on it a lot more. At the moment I am just keeping a manual voltage at 1.36v for 4.5Ghz which is Prime stable 8 hours. I will revisit the offset mode later when I know a little bit more and have more time to play with it.