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Using Advanced Clock Calibration (ACC) to increase Phenom ii overclock - Page 2

post #11 of 21
Thread Starter 
^ Someone has to look like an ******* before people start reading the posts.

I understand completely about VRMs. That's why I have a VRM heatsink, and 2 temperature diodes onto the 2 hottest phases. That's why I am making sure my VRMs stay under 85*C, and it's why I'm currently testing overclock set-ups where my VRMs are staying at 65*C on average after hours of prime95 and only maxing at 72*C.

What do motherboards have to do with max overclock limits?

This isn't even the question that's being asked.

The OP is asking and trying to start a discussion about Advanced Clock Calibration on Phenom II x4 overclocks.

prime95 has run for 7 hours on ACC enabled 3.7ghz@1.488vcore (50-53*C cpu core temp, 65*C VRAM temp). It appears to me that ACC helps increase phenom ii overclockability, but I'm not sure, because most of my prime95 fails have been at 5+ hours (making me think temps are my major stability issue), making me think it's giving me at least 200+ mhz.
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post #12 of 21
Thread Starter 
So has anyone used ACC to help an overclock on a phenom ii?
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post #13 of 21
Quote:
Originally Posted by Belial View Post

So has anyone used ACC to help an overclock on a phenom ii?


Ok.here's my best "being kind' explanation.

No one is answering you because the answer to your question is moot, even though you posted the answer in your question.let me help you
Quote
"However he was also keen to point out it may or may not provide additional MHz over leaving ACC disabled - it's entirely down to the quality of the CPU and its synergy with the motherboard and BIOS."

Each and every different CPU core is different.The motherboard,the quality of it's components,the bios all effect an overclock. You have about the cheapest form of AM3 mobo available. There is a reason why most AM3 boards are more expensive. Quality of components and design.


Here's is the CPU support page for a Biostar A770E.
http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=450#cpu
Notice max wattage is 125w
Your C2 955 is 125w,at stock speed and voltages.When you overclock and overvolt,you raise the power draw.At 1.5v,you are probably pulling 150w. Your board was NEVER designed to run that much wattage.
No one can tell you what is holding you back,either CPU,heat or motherboard or your inexperience in overclocking because we don't have it to test.
There is no benefit for you to even think about ACC,because I guarantee you you have bigger problems.The guy who posted that article is a master overclock who can overclock a Phenom in his sleep.He's looking for every single point in benchmark scores.That's not a subject for beginners.Focus on the basics first.Get a decent overclocking board.

You need to be asking "How do I properly overclock my CPU?", not trying to tell us what you want us to say.
First thing you need to do is get your voltage lower.Too much voltage will be unstable just like not enough.Put your memory at stock settings.Overclock one thing at a time.thumb.gif
Edited by Redwoodz - 11/16/12 at 6:55pm
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post #14 of 21
Thread Starter 
Quote:
Each and every different CPU core is different.The motherboard,the quality of it's components,the bios all effect an overclock. You have about the cheapest form of AM3 mobo available. There is a reason why most AM3 boards are more expensive. Quality of components and design.

The difference in motherboards, as I understand it, are:

- The holes fit
- Chipset (basically, ability to overclock, ie tweak cpu settings, and SLI, the former which is on even the cheapest motherboards that are sold by themselves, the latter necessary in most builds and to most people and irrelevant to overclocking).
- VRMs , which is a huge deal, but you can see in my sig, post history, etc, that this is not an issue for me (i have a heatsink and 40mm fan specifically mounted on my VRMs, as well as 2 discrete temperature diodes that let me know that I never even cross 70*C even at the highest of vcores)

Thanks, but your post is condescending and irrelevant. Next time just post "No, I am completely inexperienced with ACC and am not knowledgeable on the subject"

On a side note, I found out what was holding me back, it was the IMC. Still doing some testing but basically ram clock is an issue in stability, as in 24 hour prime95 stability (it's not an issue if I'm okay with 8 hours or less of prime95, or IBT).

What I want to hear, is people's experiences with ACC with phenom ii or am3 chips, regardless of the results. There seems to be a little bit of information on ACC being relevant, but it's not quite clear, and most of it is just user-experiences. I figured the biggest overclock forum would have a few people who have experience with it.

From what I've gathered so far, it helps in increasing overclocks/stability at the very edge, and only in certain chips, which have imbalanced cores. The best I've read is that it changes certain values in the system code to make what would normally be manifested as unstable, as acceptable, as opposed to changing voltages, frequences, et cetera. So I don't even know if it results in a true overclock, and how you would even go about setting it.

I'm still working on my prime95 24 hour stable overclock, when i figure it out, I'll see if I can squeeze more out using ACC. I've already gotten 24 hours on 3.6ghz though, so that's well within the 3.6-3.8ghz range people say phenom x4 c2's get.

I don't know what qualifies as 'experienced' when it comes to overclocking, but this is not my first time overclocking. As smart as you are, you have no clue what ACC is either. Looks to me your just as stupid as me and everyone else on this one.
Edited by Belial - 11/16/12 at 9:04pm
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post #15 of 21
Your first fallacy in this latest post is in the "my VRM's are ok" part. Temp is part of the equation,not all. Quality of power given is very important. You should read up on VRM's,as TDP is only part of the story. You will find out the hard way I'm sure.
No one uses ACC to overclock a Phenom.They use ACC to unlock cores.

A polished turd is still a turd at heart.
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post #16 of 21
Thread Starter 
Yes, I'm aware of quality of power given. I know it's hard for you to understand, but I've read all the same articles that you have too.

Please leave troll. Your total lack of knowledge on ACC is evident, thanks for your input.

And people have used ACC to overclock Phenom II's. As shown in the OP, AMD's tech has stated ACC is useful for some Phenom II cores, and some people have used it with success. It's just hard to find specifics on it because AMD has no official information on it.
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post #17 of 21
Quote:
Originally Posted by Belial View Post

Yes, I'm aware of quality of power given. I know it's hard for you to understand, but I've read all the same articles that you have too.
Please leave troll. Your total lack of knowledge on ACC is evident, thanks for your input.
And people have used ACC to overclock Phenom II's. As shown in the OP, AMD's tech has stated ACC is useful for some Phenom II cores, and some people have used it with success. It's just hard to find specifics on it because AMD has no official information on it.



thumb.gif http://www.hwbot.org/user/redwoodz/
All with low cost budget components
12 years experience.
and you?
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post #18 of 21
Thread Starter 
It's a very simple discussion question. Has anyone ever used ACC to influence an overclock on a Phenom ii?

It's a very simple yes/no. Has nothing to do with my system or my results. Your incredibly obnoxious. It's not hard to read, and you clearly have a problem, so please, keep it out of this thread and PM me if you really must tell me something that doesnt make any sense. And I'm getting under 60*C load VRMs, and getting 24 hour stable on 3.7ghz, so clearly, my motherboard is not the issue. Not that I was even asking for help on my specific overclock anyways.
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post #19 of 21
Quote:
Originally Posted by Belial View Post

It's a very simple discussion question. Has anyone ever used ACC to influence an overclock on a Phenom ii?.

Quote:
Originally Posted by Redwoodz View Post

No one uses ACC to overclock a Phenom.They use ACC to unlock cores.

Perhaps you should read the existing replies before posting again, Belial.
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post #20 of 21
Quote:
Originally Posted by Belial View Post

Phenom ii 955, I'm having trouble pushing 3.6ghz and above, no matter the voltages (1.502-1.568vcore, seems like temps might be a limiting factor in stability as well, but im keeping lower than 60*C).
It appears that ACC might be helpful to overclocking this cpu:
http://www.bit-tech.net/hardware/cpus/2009/05/11/overclocking-amd-s-phenom-ii-x3-720-be/1
http://www.overclock.net/t/547258/any-idea-what-acc-advanced-clock-calibration-do-to-phenom-ii-x4/0_100
I'll add more info as I scour the internet, but it seems more than one individual found ACC +2%+ helped them out. Who knows how reliable that information is though, is that for prime95 12+ hours stable, or just booting, but that's what this discussion is for.
On a side note, I was curious if just increasing CPU-NB speed would help cpu stability. I seem to see a few people saying that, but nothing really definite (maybe they meant cpu-nb voltage).

Man, this thread kinda exploded... headscratch.gif

I'll say with the experience I had with my MSI 790FX GD70 that setting each core using ACC was useful in helping weaker cores run with more stability on a core-per-core basis but I noted no actual gains in max MHz (Suicide runs), only that it seemed to help extend the max OC'ing "Stablity" range of my chips before they went wonky and crashed. Not saying that you or anyone else didn't go farther with the same CPU voltage when tweaking with ACC , that's just the experience I had with it.

I will say though ACC itself used to tune the indiviual cores of a chip could enhance your stability if you have a core that acts up early compared to the rest but doesn't do anything if wanting to see how far you can actually push the chip in MHz as in to the max. Yes, folks have used it also to help unlock hidden cores that otherwise would not have worked by changing values on a "Per Core" basis.

As for using it to actually OC a chip, no it doesn't do that - It's just another tweaking tool you can use to improve stability but it does work at least provided it's used properly.

I'll also say increasing CPU/NB speeds alone will improve RAM performance but like anything else, the higher you go, the greater the chance instability could set in and that's gonna depend on the chip itself. Of course you'd need more CPU/NB voltage too but that's a double-edged sword in that the increased voltage there will make the chip run hotter as well.

Could be wrong here BUT that's my take and experience with it to the best of my memory. Too bad the named board is now dead (Which is why I'm having to remember all of this) and my CHV doesn't seem to have the ability to tweak indiviual cores that way - Or at least I haven't seen that in the BIOS itself yet but I'll admit I haven't really looked for it either. redface.gif
Edited by Kryton - 11/19/12 at 9:13pm
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