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2500k @4.5ghz...Got some questions - Page 2

post #11 of 28
Quote:
Originally Posted by Captain318 View Post
All your doing with Offset is raising your Vcore till your stable and your chip will dial back the volts when not under load. In my case I use a Offset of +0.90v and peak around 1.3v under load but idle about 1.120v Your required offset will depend on your chip same as setting it manual. Nothing really scary about it. Also I dont use LLC
You missed his point.
All of the P8P67 boards (don't know about the LE/M boards) have a *BUG* where the offset CHANGES to a stupidly high number when you load profiles. For example, if you have an offset of 0.192v, then you switch to a profile for a different speed and/or switch back, that offset may become 0.920v, or 1.092v. This bug has been CONFIRMED by a moderator. Not only that, it's IMPOSSIBLE to even enter this offset manually as this exceeds the vcore limit. But the bug will make the board put in 2v+ into the CPU.

And if this happens, you can kiss your CPU goodbye if you don't catch it.
This bug does NOT happen with manually entered voltages.
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post #12 of 28
Quote:
Originally Posted by Falkentyne View Post
You missed his point.
All of the P8P67 boards (don't know about the LE/M boards) have a *BUG* where the offset CHANGES to a stupidly high number when you load profiles. For example, if you have an offset of 0.192v, then you switch to a profile for a different speed and/or switch back, that offset may become 0.920v, or 1.092v. This bug has been CONFIRMED by a moderator. Not only that, it's IMPOSSIBLE to even enter this offset manually as this exceeds the vcore limit. But the bug will make the board put in 2v+ into the CPU.

And if this happens, you can kiss your CPU goodbye if you don't catch it.
This bug does NOT happen with manually entered voltages.
Oh well, I was unaware of any such bug. I don't use profiles anyway
     
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post #13 of 28
Quote:
Originally Posted by Falkentyne View Post
You missed his point.
All of the P8P67 boards (don't know about the LE/M boards) have a *BUG* where the offset CHANGES to a stupidly high number when you load profiles. For example, if you have an offset of 0.192v, then you switch to a profile for a different speed and/or switch back, that offset may become 0.920v, or 1.092v. This bug has been CONFIRMED by a moderator. Not only that, it's IMPOSSIBLE to even enter this offset manually as this exceeds the vcore limit. But the bug will make the board put in 2v+ into the CPU.

And if this happens, you can kiss your CPU goodbye if you don't catch it.
This bug does NOT happen with manually entered voltages.

Someone on OCN had this happen to his cpu with a p8p67 pro I believe. toasted the chip
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post #14 of 28
Quote:
Originally Posted by wupah View Post
Someone on OCN had this happen to his cpu with a p8p67 pro I believe. toasted the chip
that is correct, it was grunion's chip that died as a result of that bug (speculation)
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post #15 of 28
Thread Starter 
well a little update

i had been running almost 12 hours on 4.5ghz @1.290v and i had to shut down my comp to install a fan in my side window...well while it was booting right before windows logon showed it BSOD...but i ignored it and restarted and tried to stress test it...it blended for about 23 mins and then BSOD

so ive bumped it up to 1.295v and running a test now to see how stable it is...plus with my side fans going im seeing about a 2-3 temp drop from before

ill run it for an hour or so and then tomorrow morning test it for longer along with some shut down and idle tests to see how stable it is
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post #16 of 28
Can you open the bsod and see what code it was (or if you remember). If it's 0124 then that means there's not enough vcore.
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post #17 of 28
Quote:
Originally Posted by Falkentyne View Post
And your board is NOT a M4E, so you are never going to have identical vcore at idle and load. Only the M4E from what I've seen has been able to keep the vcore within 0.01v range at LLC 75%.
My P8P67 Pro is pretty close. When using Ultra High LLC (75%), my idle voltage is the same as set in BIOS and my load voltage is only 10mV higher. This was measured with a DMM.


OP: If you're running Prime95 for stability testing, make sure you're running the blend test. I prefer 12H+ for stability.
Edited by compudaze - 5/14/11 at 10:13pm
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post #18 of 28
Thread Starter 
Quote:
Originally Posted by clerick View Post
Can you open the bsod and see what code it was (or if you remember). If it's 0124 then that means there's not enough vcore.
yeah it was a 124 code...so i upped the volts to 1.295 from 1.290...it was stable for 27 minutes...but its bed time so ill stress it some more tomorrow morning


also question for those that read this thread....is continuous P95 tests bad?

i mean im sure it is in the long run...but do i run the risk of killing the cpu quickly with doing so many of these tests trying to find a stable OC?
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post #19 of 28
Thread Starter 
Quote:
Originally Posted by compudaze View Post

OP: If you're running Prime95 for stability testing, make sure you're running the blend test. I prefer 12H+ for stability.
aye thats all i run...i would do a 12 hour blend but ive yet to have the actual time to do it with a OC thats been stable for more than an hour

once i get a OC thats been stable for a while with intermittent tests ill do a full 12+ hour blend
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post #20 of 28
This "Degradation" is perfectly normal.
You're stress testing on the "low" end of the vcore needed for stability, and many (apparently not all, but a lot) CPU's wind up losing some of the lowest vcore ceiling from when they are new, or first run at a certain overclock, and slowly need a little higher vcore than initially. This not "abnormal" degradation, but seems to be normal with these chips. Going from 12 hours, to 3 hours, to 35 minutes to a BSOD, is a common symptom.

The chips usually settle after a certain point and remain stable long term. I was able to do two 4.5 ghz 1.260v primes for 12 hours twice, after having degradation when it used to prime at 1.236v, to the point where it would BSOD within 30 seconds at 1.236v (originally ran for multiple hours). This was caused by gaming and stress testing at 5 ghz, 1.404v-1.428v. Hopefully all the voltages will settle down and 5 ghz will need 1.440v game stable (too hot to prime test there now) and 4.5 ghz will even out at 1.260v and not degrade further (any more degradation would be caused by 5 ghz voltages, IF the chip isn't broken in/settled yet, which I'm hoping it will be).

Maybe I'll do some bad company 2 for a week, at 5 ghz, then do a 12 hour prime run a week later and see if it still passes at 4.5ghz, 1.26v or if it bsod's...

And repeated prime testing is fine as long as your voltages aren't too high and you keep the chip cool. You're getting into danger land if you prime > 1.4v unless you have some very good cooling.
Edited by Falkentyne - 5/14/11 at 10:29pm
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