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OC no longer stable after changing motherboard and PSU

post #1 of 12
Thread Starter 
So I used to have a ROCK solid overclock on my rig when I had an EVGA p55 FTW + i5 750, but I had to change my motherboard to an ASUS P7P55D-EVO - both motherboards looks like from the same caliber. I even thought when buying that the P7P55D-EVO was a better board for overclocking.
The PSU was an antec true power quattro 850w, and now it's an antec high current pro 850w, which should also perform better than the older PSU.

My settings for 4ghz were 1,365vcore and 1,225vtt. It was stable for at least 2 hours of linx (IBT) - I stopped the test at 2 hours, with max ram.
Blend for 5 hours - I stopped the test.
Small and large FTTs, both for 5 hours too, as well as a custom test in prime...


So, now with a new mobo and PSU, no matter what voltage I throw at the CPU I can't get it stable at 4ghz. I tried to go up to 1,42vcore and 1,35vtt just to see what would happen, but no.. can't complete a full IBT run.
Tried both 20x200 and 21x190

I'm running it at 3,8ghz now but it needs too much voltage.

I have already reseated the CPU in the cooler and nothing changed (not even temps).


So, what seems to be the problem here?
Edited by EduFurtado - 4/14/12 at 2:53pm
post #2 of 12
Thread Starter 
Updated title so maybe this thread could call some attention... I had only 10 views after two hours...
post #3 of 12
Not familiar with the boards much myself. But check everything. You may have to make other adjustments on the Asus board for a stable OC.
Boards from different manufactures will over clock slightly different. If you could post pics of your Bios settings. That should help those more familiar for you.


Sent from my Galaxy Nexus using Tapatalk 2
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SixthElement
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post #4 of 12
Do you read the vcore through CPUZ before/after changing the board?

My guess these two boards treat LLC differently. Vdrop might be the reason. Worth checking.
post #5 of 12
Thread Starter 
Quote:
Originally Posted by Rebelord View Post

Not familiar with the boards much myself. But check everything. You may have to make other adjustments on the Asus board for a stable OC.
Boards from different manufactures will over clock slightly different. If you could post pics of your Bios settings. That should help those more familiar for you.
Sent from my Galaxy Nexus using Tapatalk 2

Thanks for the reply
I consider myself an experienced overclocker because I've overclocked many CPU with different mobos already and I've been doind this for 4 years now. What I was thinking is that it should be a hardware problem, for example, my CPU has degraded for some reason.

I tried tweaking the settings my own way, as well as messing with everything and even looking up on guides for noobs to overclock with this board.
:'(
post #6 of 12
All systems are unique. There is, unfortunately, no "cookie cutter" or interchangeable method for OCing with different components. Thats the nature of the Beast. In fact I would guess interchanging to exact parts for each other may affect the OC results.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by kalvin37 View Post

Do you read the vcore through CPUZ before/after changing the board?
My guess these two boards treat LLC differently. Vdrop might be the reason. Worth checking.

I tried both LLC on and off, but I was hoping I could use the same settings I had in the other board (vdroop off, which is LLC on).
I'm pretty sure they are the same settings because I have everything well documented.
post #8 of 12
Thread Starter 
Quote:
Originally Posted by Jolly Roger View Post

All systems are unique. There is, unfortunately, no "cookie cutter" or interchangeable method for OCing with different components. Thats the nature of the Beast. In fact I would guess interchanging to exact parts for each other may affect the OC results.

Agreed, same models but different parts can render different results, but usually that means you will need 0,1 more or less volts. This ain't the case here.
post #9 of 12
Thread Starter 
Looks like it's just the CPU that has degraded for some reason... Even if I have never trown extremely high voltages on it
post #10 of 12
I doubt the CPU has degraded.

Seems to me you should disable all power saving features and the like on the new motherboard. Also leave your memory timings at default (forcing stock timings should be fine too), and make sure memory is at or below stock speeds. With all that I am confident you should be able to return to 4GHz or close to it. If you can't quite reach 4GHz on the new board, it definitely could be a "margin of error" type issue. But even then you should still be able to get there again just by bumping the voltage as you said your previous OC was rock solid.
    
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