How does Advance Clock Calibration work?

[Particle]

soundood, I don't think it's so much what you say as how you say it.

Abrasive, challenging--like waving a red towel in the middle of a bull pit:
"lol, i totaly agree with you, some of the rubbish that AMD has been spewing is beyond me, the whole release of boards with the SB600 chipsets, to then release the exact same boards with a SB750 chipset is pure robbery."

Same thing only debate-inviting instead of provocational:
"I completely agree with you. AMD's current explanation of how ACC works smells fishy to me. They released motherboards with the SB600 chipset and then quickly re-released with the SB750. That strikes me as bad business and insulting to the customers."

I do disagree with that statement though, unless you aren't really serious about SB600 to you looking like a scam. That southbridge was their leading model until the SB7x0 chips were finished up, what--two years later? It doesn't seem like a crime to me that they're doing development cycles and releasing updated technology as they invent it.

[GenTarkin]

I think I remember reading that part of those 6 pins is used to enable higher multpliers on the phenom BE's that werent available on previous chipsets before?
Is this true?

[Jimmer411]

As far as I'm concerned ACC doesn't do anything.

[demonkevy666]

I think I remember reading that part of those 6 pins is used to enable higher multpliers on the phenom BE's that werent available on previous chipsets before?
Is this true?

lol they all have multiplier that go up to 25 on BE's

I recall those 6 pins also use a pci-express lane or something.

[Oliverda]

As far as I'm concerned ACC doesn't do anything.

It's an ASUS M3A78-T issue.

[SocketMan]

lol they all have multiplier that go up to 25 on BE's

I recall those 6 pins also use a pci-express lane or something.

I thought it was to provide an additional Voltage/power to the CPU.
I also remember (sort of) a discussion ( here at XS at the start of this year)
about the "future" boards,now known as the 790xx +SB750, where
a newer clock generator was going to be added to the south bridge.

edit*
Found a pick

http://www.digit-life.com/news.html?10/63/37

[merkk1]

Hi guys
Well i did some ACC testing to night , my 9850BE 3 of core are good running cores but core number 4 runs like crap . Without the ACC 2.7ghz was all i could get with my old board . Now with the a79a-s ACC set at +2% i can get 3.0 ghz 24/7 trouble free but as soon as i try to clock up any higher i drop core 4 when running prime .So i put ACC to the real test . I bump the cpu up to 3.105 ghz. set the volts for the cpu to 1.4v to give ACC something to work with than i started. I kept the 3 good running cores at +2% than i stared bumping core 4 up +4% core 4 crash as soon as prime started bump it +6% same thing , bump +8% same thing , bump it to +10% bam! prime up and running on all 4 core i let it run throught 3 test passes on the 3 test change over to AOD stability test run that for 30 min than i do a 3Dmark-06 run and then jump right into a vantage run pass on everything NP so now it look like the 4 core are all blance out now , Tomarow night i see what happens if i try to bump it up to 3.2ghz . The hole point being if one of your cores are crashing before the other try cranking in the ACC on the single bad core to see if you can bring it in line with the others. ACC go up to +12% my thinking is if they did want me to use it they shouldn't have put it in the bios . Just something to think about .

[merkk1]

Follow up so as i trun the power off on my pc and look at it i say to my self Hummmm it a Phenom cpu do you think it will restart again ???
hell no even when it pass all the other stuff earlyer even when i get prime to right on the core 4 the dran thing will not repost so even when
using ACC getting the cpu blance out still not a sure thing when going for the higher over clocks . I had to declock back to 3.0 ghz to get it
to repost . Well it getting late need some sleep nite all.

[sandeep]

Anyone else having success with ACC? Please share ur experiences.

[RiverRicer]

I've done a bunch of ACC testing using the 4-thread version of Prime. My observation is that the 'weak' core is actually completing the Prime iterations faster than the 'good' cores. In the case of my 9950, core 2 (third core) seems to get there faster, but also crashes first when pushed. Using that logic, I reduced ACC on that core, ie. I'm currently running 2-2-0-2. However, it doesn't seem to make a big difference from 0-0-0-0 or 4-4-4-4. What I have found is that a setting on a particular core >±4 from any other core causes boot-up problems. For example, if I set ACC at 6-6-0-6, no boot.
Since all my testing was done using bios, not AOD, the no-boot scenario affects my mental stability! My max, rock-solid o/c so far is 3.25@1.4vcore, 250fsb.......not very impressive, but a solid, Prime blend stable increase over stock speed. I've run the chip at 3.5 with about 1.55vcore, but couldn't find stability with Prime or OCCT.

[merkk1]

In my testing of my bad core i can running 3.0ghz with ACC set to +2% all time no reboot trouble run prime np stable all the time . That a .300 ghz pick up from no ACC, to get 3.1 ghz i than have to bump ACC to +10% on core 4 it will run stable i can run prime np play game it all good . Now when i trun it off it will not reboot i back ACC on core 4 to +2% declock the CPU run it for a bit than i can once again reclock the ACC back up again using +10% acc on core 4 .It like the hole system has to reset it self for it to work again with ACC setting set high or it get hot some how with a high setting just not sure .

[Particle]

@River: What happens when you keep the delta lower, like 6-6-4-6 or 8-8-6-8?

[RiverRicer]

@River: What happens when you keep the delta lower, like 6-6-4-6 or 8-8-6-8?

I've tried some higher + settings on the cores while keeping the deltas close, but my chip doesn't seem to like anything over +4 on any one core. ACC settings are highly chip-dependant and it would be a whole lot eaisier if AMD would just come out a say what ACC does, or at least how to adjust it for various core scenarios.

On the other hand, I'm happy with a rock solid +650 o/c. Without ACC it would have been a lot tougher.

[MoF]

I've tried some higher + settings on the cores while keeping the deltas close, but my chip doesn't seem to like anything over +4 on any one core. ACC settings are highly chip-dependant and it would be a whole lot eaisier if AMD would just come out a say what ACC does, or at least how to adjust it for various core scenarios.

On the other hand, I'm happy with a rock solid +650 o/c. Without ACC it would have been a lot tougher.

http://67.90.82.13/forums/showpost.p...1&postcount=53

[Macadamia]

kazgirl's post is spot on.

Just one minor niggle - K10 also had an ondie clockgen, it seems. Only replaced by SB750 when possible.


Oh, and it seems that somebody at Coolaler (again) is reviewing the new MSI 780G + SB750 board and an ACC enabled BIOS.

[sandeep]

Hey guys keep posting your ACC experiences. Hope we can unravel this mysterious ACC