Advanced Clock Calibration - what is it?

[SickBeast]

I've done some research online and I can't seem to find out anything definitive about this feature. Apparently AMD has not stated exactly what it is or what it does.

Some people are saying that it's useful to stabilize overclocks by helping to stabilize a faulty core.

Other people are saying that it's only useful to unlock Phenom II cores, and that it only helped the Phenom I's to obtain higher overclocks.

I've had a single core fail in Prime95 and I'm wondering if ACC could help me out. Do I add (+) or take away (-) values in terms of advanced clock calibration to help stabilize a faulty core? My motherboard goes from -12 to +12.

TIA :thumbsup::thumbsup:

 

[richierich1212]

Try -2 value for that core that seems to fail. It should help a little. If not, you may need to bump up vcore a little.

 

[paperwastage]

you keep trying combos, if the AUTO-ACC All cores doesn't work

or up the voltage a little

 

[Rhoxed]

its annoying and confusing all at the same time. I've spent full days on ACC trying to figure out how it helps - from what I got out of it, + will give you lower voltage on clocks but limit potential, and - will raise voltage on clocks and help reach maximum.

meaning -
(not real numbers, just a visual)
3.4ghz without acc using 1.35v with a max clock of 3.8ghz 1.5v
3.4ghz with acc(+) using 1.3v with a max clock of 3.7ghz 1.42v
3.4ghz with acc(-) using 1.39v with a max clock of 3.9ghz @ 1.55

now - this is how it worked out for me, 2 mobo's 2 different phenom 2 x4's
with phenom 1 i only received boost in clocks, no matter what setting was used (went from 2.8 max without ACC to 3.3ghz with ACC on 9850BE.)

 

[SickBeast]

Thanks for that, Rhoxed.

I'm going to try messing with the "-" values to try to get a bit more out of my setup.

The thing is, I think I might be FSB limited. I'm running at 300mhz FSB right now.