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Overclock Z68 PRO3-M i5-2500k Stuck

post #1 of 6
Thread Starter 
Newbie here. Be merciful. First time OC but very experienced, EE. Understand all the terminology and designs (I hope). I have read this forum and Googled to the end of the net on this.

ASRock Z68 PRO3-M, i5-2500k. Set BIOS to OFFSET Mode, initial offset =+.03v. LLC=3 (or 4 or 5). Boosted pwr limit to 200, core current to 200. Started at mult=40. Using Prime95 to stress.

Anyway, oversimplified status is when I increase mult to 45 in AXTU (idle), as soon as I click APPLY, freezes. Never get to stress test. Passed stress test at 43 for 1 hour.

Last VCORE reading was 1.340 at 43 under load. Tried increasing offset to .05 at 45 but still freezes (idle). Reading Vcore with AXTU, CPID. REALTEMP temperatures never get above 60c, Hyper 212+ fan.

I have played with LLC, did some testing with fixed Vcore and found level 3 (5 is Off) holds it very close. Problem seems to be at idle anyway.

Vcore readings are reasonably consistent in different apps. Did notice that in FIXED mode, set Vcore to 1.29 and all apps said it was 1.34 at idle and load. So I am concerned as to Vcore reading but would like to use OFFSET mode anyway.
post #2 of 6
At 4.5GHz you might need to feed your chip some more voltage, up until 1.375V, maybe that's why it freezes at that speed.
LLC will feed more voltage to the CPU whenever it needs (load) to assure it will remain stable, that's why you see sometimes readings superior to what you set in BIOS.
It would be a good idea to disable all the power saving features in BIOS, like C1E, cool n' quiet, or whatever it is called in your board, etc. Having those on results in instability sometimes.
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post #3 of 6
Thread Starter 
C1E off did not help. However, I now think this is not an idle problem. I was using AXTU in windows to increase Multiplier to 45. Since system is basically idling at that time, I assumed this was an idle issue. So I started stress test first, then upped ratio to 45 and it locked up. So I think the problem is simply can't make it to 45 at load or idle.

So need more help in setting Vcore. I am using OFFSET mode, LLC=5 (off). I simply played with the offset until Vcore =1.34 loaded (offset= .05). I am afraid to go higher. I tried FIXED mode but noted that if I set Vcore to 1.29 actual reading was 1.36. Should I believe my Vcore readings? They are approx the same from AXTU CPID, and HWmonitor. Don't understand discrepancy in fixed mode with LLC off (it is higher, should be lower than set point from droop). I am sure LLC=5 is off because at LLC=2 it goes even higher.

And.... what exactly is OFFSET offsetting from? I thought it was VID. I read VID using CoreTemp. At idle it is 1.251 but at load it is 1.35. Does VID vary with frequency and load?

Please Help more. Thank you.
post #4 of 6
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. Don't worry about it bsoding, 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 to around level 5. 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 the Ultra high (75%) LLV 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 (READ THIS ABOUT PLL). 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. Ensure that the CPU PLL is at 1.7 to begin with and vccio (VTT) is on 1.125v.


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


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 - 250
Long Duration - 250
Core current Limit - 250

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!!!
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post #5 of 6
I have a Z68 Pro3, which is the ATX version of the Pro3M, and I had my offset at +.090V. I've run the blend95 for 18 hours with no issues but I also get a freeze when I use AXTU.

Here are my BIOS settings if you want to know:
UEFI settings
     
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Crucial M550 M.2 SSD Western Digital Caviar Black Hitachi Ultrastar Crucial MX200 
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Corsair H80i Windows 10 Professional Dell Ultrasharp U2412M Corsair K70 
PowerCaseMouseMouse Pad
Corsair AX760 Silverstone Sugo SG-10 Logitech G602 Steelseries gaming mousepad 
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Creative SoundBlaster Z Creative Aurvana Live! 2 
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Intel Core i3 2105 ASRock Z68M/USB3 EVGA GeForce GTX 760 CORSAIR Vengeance 4GB (2 x 2GB) DDR3 1600MHz 
Hard DriveOptical DriveOSKeyboard
Crucial M4 ASUS DVD burner Windows 7 Logitech K750 
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post #6 of 6
Thread Starter 
munaim1 & wanako
At 45 can't even boot into bios. Have to reset CMOS. So I am trying to figure that out before I even get to stress testing. Remember at 43, OFFSET mode, +.03v pass stress (only tested for 2 hrs, but can certainly boot). Max core temp was 60c. I also tried FIXED at Vcore=1.42.

I have set offset as high as +.06 which gave Vcore= 1.4. I don't know if I should go higher. Had already established LCC level=4 gives pretty flat Vcore from no load to load.

So, first goal is just to get it to boot at 45. Would like suggestions for max Vcore to try, which mode (FIXED or OFFSET) and other settings, voltages just to get it to boot up.

Continuing thanks.
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