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post #14 of 20
I never really had to use ACC in manual mode i always left it at AUTO...but from what i understand about it is that you need to do a core balance first and see which core is the weakest in terms of overclocking eg

1 = 4ghz
2 = 4ghz
3 = 3.7ghz
4 = 4ghz

I think what you are supposed to do there now is use ACC +6 or +12 to stabilize core 3...again don't quote me on it but i think that's how you use it.
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post #15 of 20
Thread Starter 
Quote:
Originally Posted by amd-dude;13065957 
I never really had to use ACC in manual mode i always left it at AUTO...but from what i understand about it is that you need to do a core balance first and see which core is the weakest in terms of overclocking eg

1 = 4ghz
2 = 4ghz
3 = 3.7ghz
4 = 4ghz

I think what you are supposed to do there now is use ACC +6 or +12 to stabilize core 3...again don't quote me on it but i think that's how you use it.

good explanation +rep

need some more experiences
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post #17 of 20
Hi, just a long shot..have you updated your bios? if so alot of other people using the same mobo are suggesting to downgrade your bios to the very earliest available as the new bios from biostar have stopped core unlocking/low unlock percentage which could be the problem.

Just my 2 cent worth.
    
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post #18 of 20
Quote:
Originally Posted by dlee7283;12984206 
...core leveling values to both -6,-6 to work

Can someone explain what these +/- values mean?

A TA790XE, with Propus 620. To the best of my recollection (Didn't keep the logs as I should have):

Core leveling is one of the settings I tinkered around with, once I had achieved a modest, stable overclock - let's say in the neighborhood of 3GHz, 1.225V. Plenty of P95 Torture Test, and P95 pretty much always running - if there is a problem, there will eventually come a "round-off error".

I had worked up to there with Core Leveling set to "Auto." When I set CL to "All Cores" and "0", the stress test failed. The same core failed several times, so I presumed it to be the weakest, and set that core to "-2" or "-4", and the system could again survive a stress test. *

* Unless, of course, I'm off 180 degrees and set the problem core to "+2" or "+4". I think I decided that CL was reducing load on the core ("-" for stability), but perhaps it was tweaking voltage or something (i.e. "+" for stability).
I don't have the tools to measure these effects. But I am certain that, if one sets the right conditions (e.g. a system on the edge of stability), and runs a test that isolates each core, one can see the effect. If your CPU is anywhere near its limit, set one core to "-12" and then run p95 to see if that core bites the bullet.smile.gif Also, one might learn something by taking that same scenario, and adjusting the other cores, instead. I'm sure I tried this, but again, this is from memory, and I don't want to mislead you with a bunch of made-up sh** smile.gif

I hope this helps, and please, share anything you learn. If I discover anything more concrete, I will post it here. (I am now using a TA790GXB BS sent to replace the XE, and I'm experimenting with undervolting. We're stable at 2200MHz, 1.0125V. -Maxing out at 35/38 Celsius, with AC Freezer Pro cooler - about 30C ambient. Perhaps now's a good time to reboot and fiddle with CL.)
post #19 of 20
Mine works on every setting i put it on. So i have absolutely no clue.
post #20 of 20
Corrections and Updates.

Corrections
I was adjusting (as I'm sure many of you knew already) the ACC, not CL. dlee7283 - I'm not sure how your BIOS labels your options for CL, but my choices are Force [1..2..3] Cores, and Use All Cores.
I have not tested the operation/functionality of this feature, but I'm sure I will.

Update
On my TA790GXB, BIOS date 2009-05-25, my Propus 620 is running stable at 2200MHz, 1.0125V VID, 0.99V VCore. ACC is disabled. Changing ACC to per core, and 0%, 0, 0, +10 resulted in failure to POST, as did many other combinations of 0, +10, -10,..., and even the auto setting.
I think I will have to try it some more with my system a little closer to the center. To describe where it stands, P95 has run for hours with the current settings. Changing only the multiplier from 11, to 11.5, the machine will load Win7, but P95 erred after 30 minutes or less. A mult of 12, machine POSTed, but could not load OS. So, it is close to it's limit.
If anyone wants any other detail, please ask.

Remember, I'm pulling for you; we're all in this together.
Edited by noneYet - 8/4/11 at 9:38am
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