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I built a system with the i5 2500k, now I want to overclock it.

Problem is that this is my first time and I don't want to mess up, so I need some help from you professionals


My motherboard is the Asrock p67 extreme4 Gen3 and I plan to OC it to 4.0Ghz, stock fan.

What should I put my voltage as and what settings/features should I enable or disable in the BIOS?

Thanks :)
 

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Lemme know what you end up with because I have the same motherboard and will be bringing my system online in a day or two. I'll be overclocking my 2500k to 4.5ghz but since we have the same board a lot of our settings will be similar.
 

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Maybe this'll help


Here's my quick little sandy guide:

Quote:


The only things will that will require multiple changes are the vccio (VTT), PLL voltage and vcore, refer to this:

Set the whole thing to stock and start again. This time only change the RAM to XMP (STOCK) and run prime blend for a few mintues to see that your CPU is functioning properly.

Then comes the task of determining the voltage for the multiplier, but that comes after you find the correct LLC setting for your mobo. What you want to do is set the LLC to the one that is closet to what you set it to when the cpu is under load, so for example if you set 1.35v and under load it's 1.31v and that's level 3 then you may have to increase the LLC, now depending on high your mobo works it could like so: 1 being the highest LLC and 5 being the lowest and vice versa. The objective is to keep the voltage under load as controllable as possible without it letting it spike. These LLC settings will be different amongst mobo's. For Asus mobo's the Ultra high (75%) LLC seems to work best.

Then it comes to that task of finding the actual voltage for the overclock, however before we get to that, I would advise you to reduce PLL voltage to 1.7v (Scroll down or go to sandy stable club about PLL info). Then set the vcore manually to 1.25v, Leave C1E and Speedsteep enabled and run C3 and C6 on Auto if you can, if not leave them enabled. Also leave Spread spectrum enabled, if you find that it disrupts the bclk in cpu-z then just disable it.

Additional settings that you need to change from the get go, but won't need to be changed afterwards:

Can be found under advanced settings/cpu configuration:

Quote:


For Asus Mobo's
CPU Current Capability - 140%
Phase and Duty Control - Extreme
EPU Power saving - Disabled
VRM Frequency - Manual - 350


Quote:


For Asrock Mobo's
Turbo Boost Power - Manual
Short Duration Power Limit - 250
Long Duration Power Limit - 250
Core current Limit - 250


Quote:


For Biostar Mobo's
CPU Core Current max (AMP) - 150
Power Limit Value 1 & 2 - 200


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For Zotac Mobo's
Turbo Boost Power Max - 250
Turbo Boost Short Power Max - 250
IA Core current (AMP) - 200


Quote:


For Gigabyte Mobo's
Turbo Power Limit - 200


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For MSI Mobo's
Short Duration Power Limit- 250
Long Duration Power Limit - 250

Overvoltage is only needed when a particular multi (usually the high ones) doesn't boot into windows.

This should be a stepping stone to get your rig stable. With those settings you will eventually get to the point where you're stable.

Set the multi to 45 and the vcore to 1.25v and increase the vcore each time after you stress test, run a quick custom prime with these FFTs (1344 & 1792) like THIS and go back and change the vcore accordingly, bump it by one not big jumps and that goes for PLL and VCCIO (VTT) and VCORE!!!

Work your way up from there, increase multi, test with prime, if it fails up vcore, if not up the multi. Until you are satisfied with the temps and it is stable then continue upping the vcore to stabalise.

Just a note: The custom FFT's are not that consistant, making them not all that reliable, however if it works for you, then that's great. What I mean by inconsistant, is that it may pass once with the same settings but may fail the exact same run second time round. In that instance I will recommend you to run a standard blend test to find your overclock, using intervals of 15/30mins. This duration will increase when you're nearing stability. This is a lenthy process, one that takes time and patience, make sure your up to the task


Head over to the Sandy Stable Club for more info and tips


Here are the additionl info regarding PLL voltage, VCCIO and VCCSA: READ THIS & THIS

Quote:


Originally Posted by munaim1
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Just thought I'd let you guys know, I have been testing the PLL voltage further and found something quite amazing. With my current stable settings including the PLL voltage around 1.7v was stable as you can see from my submission to the club. For the last 10days or so I tried messing around with the PLL, I dropped it down to 1.4v and started going up, I kept on receiving the Error 124 up until I reached 1.55v and it passed both the 1344 and 1792 test along with a few hours of prime blend. My sweet spot is at 1.55v.


One more thing, BSOD Error code 101 is usually refered to the vcore being too low, Error 124 can also be vcore, VTT (VCCIO) or even PLL voltage being to high or too low.





 

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Quote:


Originally Posted by Abyass
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I tried to put the multiplier to x40, change the voltage to 1.2V and
Turbo Boost Power - Manual
Short Duration Power Limit - 250
Long Duration Power Limit - 250
Core current Limit - 250
those are the only changes i made in the BIOS

it won't boot up... did I mess something up?

Try increasing the cpu voltage.
 
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