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Need HELP I5-2500K OC 4.5ghz

post #1 of 97
Thread Starter 
Hi, I 've been trying to overclock my i5 2500k to 4.5ghz for the past few days and I can never finish prime before a bsod of 124. I assume that means more vcore and I have gone up to 1.38v and I don't think it should be that high for a 4.5ghz oc. Please help me cause I've read many guides and enabled/disabled many things and it still has not helped. I've also tried manually setting the qpi vtt voltage and CPU PLL but it's just getting me even more confused. My motherboard is MSI Z68A-GD55 B3.As of right now I have put everything on auto and slowly upping the vcore once again. I notice the CPUIO(VTT) is at 1.352 when I set it to auto

Edit: I have put the SYstem agent voltage to 0.925 and cpu vcore to 1.7. CPUIO at 1.15. BSOD on occt 40 mins in.
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post #2 of 97
First go HERE and fill in your system spec so we know what components you are running.

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 [B] (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
Quote:
For Zotac Mobo's
Turbo Boost Power Max - 200
Turbo Boost Short Power Max - 200
Quote:
For Gigabyte Mobo's
Turbo Power Limit - 200
Quote:
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. With that function, you sacrifice sleep mode. You can't have overvoltage and Sleep working together, don't know why, could be BIOS related.

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 View Post
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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post #3 of 97
Thread Starter 
I do not have LLC, I have vdroop control instead so Im guessing LOW vdroop = high LLC and auto vdroop = high vdroop = low LLC. I have changed the vcore to 1.37 and VTT to 1.15. Everything else on auto and passed 1 hour of occt, going to run prime 95 overnight and see if its still running when I wake up. I have also updated my computer profile and will attempt your prime95 test.
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post #4 of 97
Quote:
Originally Posted by Zilex View Post
I do not have LLC, I have vdroop control instead so Im guessing LOW vdroop = high LLC and auto vdroop = high vdroop = low LLC. I have changed the vcore to 1.37 and VTT to 1.15. Everything else on auto and passed 1 hour of occt, going to run prime 95 overnight and see if its still running when I wake up. I have also updated my computer profile and will attempt your prime95 test.
why have you set the vtt to 1.15?
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post #5 of 97
Thread Starter 
I set it to 1.15v because that seems to be the norm.
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post #6 of 97
Quote:
Originally Posted by Zilex View Post
I set it to 1.15v because that seems to be the norm.
Norm is actually setting it to auto. Unless your tweaking/overclocking your RAM.
Edited by munaim1 - 9/15/11 at 6:14pm
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post #7 of 97
Thread Starter 
I just failed the 1792 Prime 95 test at around 24 mins. Those were the settings I were using and I do not use auto for VTT because for some reason my VTT goes to 1.352 when I leave it on auto. The Vcore when I failed was actually 1.37 I just bumped it to 1.375 now and see how it does. I have uploaded pics of my settings.

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post #8 of 97
Quote:
Originally Posted by Zilex View Post
I just failed the 1792 Prime 95 test at around 24 mins. Those were the settings I were using and I do not use auto for VTT because for some reason my VTT goes to 1.352 when I leave it on auto. The Vcore when I failed was actually 1.37 I just bumped it to 1.375 now and see how it does. I have uploaded pics of my settings.
try settings the VTT to 1.1v instead and disable PLL overvoltage until you need it for a higher multi when it doesn't boot to the OS.

Anyways no need to run the FFT's for that long, 15/20mins is enough, move onto the next overlock and when you are content with temps and voltage stop and try and run a full 12hour blend.

C states disabled is fine, C1E enabled is good. Also try increasing the DRAM voltage close to 1.5v as possible.
Edited by munaim1 - 9/15/11 at 6:44pm
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post #9 of 97
Thread Starter 
Ill try that if tonight when I leave prime95 on and it fails.

I could not even load to the desktop without bsod of 124 after changing vtt to 1.1 and turning off overvoltage. I can only reach desktop without bluescreen at 1.32 vcore.
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post #10 of 97
In that case up the vcore as you test for stability with prime95.
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