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Bulldozer Overclocking Guide (Performance Scaling Charts, max OCs)LN2 Results coming! - Page 8

post #71 of 228
Quote:
It is worth pointing out that the Gigabyte 990FXA-UD7 has no bios setting to disable APM (Application Power Management). Without this disabled, the motherboard will maintain the TDP limit when overclocking or overvolting above the limits. As a result APM will throttle some of the cores back to lower Pstates during heavy, multithreaded workloads reducing performance.
http://www.kitguru.net/components/cpu/zardon/amd-fx-8150-black-edition-8-core-review-with-gigabyte-990fxa-ud7/24/

Its an issue with Gig boards, the BIOSes just arent good yet. Ironicaly, same issue Im having with my MSI Z68A-GD80 G3, keeps throttling when OCing, but at least it only throttles down to 4.2Ghz instead of 2.8 lol.
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post #72 of 228
Quote:
Originally Posted by Sin0822;15337578 
hey, yes i used a non public BIOS, but expect BIOSes like that as well as some more stuff coming to light in the next few weeks. I requested that BIOS for LN2 clocking, I couldn't help myself lol:
http://valid.canardpc.com/show_oc.php?id=2048489

it might be a tiny bit longer than this weekend. As i tired the board today, it lit up, but then shut down, so it might need to dry a bit more.



What i saw in my same thread in another forums is that prime95 stresses BD much more than IBT, like sandy bridge is better stress tested with P95 than IBT. So I will add that to my guide as well.
I am doing a little thing on Ln2 cooling as well to add to my guide, as well as what you guys have asked.

BTW for that 5ghz i used NB of 1.2v, CPUNB of 1.3v, CPUv as what you see with LLC. HT Link and CPU NB were kept low, like at 2300mhz


Pleeeease tell me we will get LLC!!!
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post #73 of 228
Great stuff ! thanks for sharing.
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post #74 of 228
Quote:
Too much voltage will HURT performance, don’t use brute force like all the Bulldozer reviews, it doesn’t take 1.5v for 4.5ghz. So please, walk down the voltages!!!!!!!!

This definitely cannot be applied to my chip.
Quote:
Originally Posted by Rebelord;15337206 
Unless your temps are outrageous, what would your H100 have to do with stability?

Well if it's not my temps, I must have gotten a bad chip because it's not stable at all. I'm running 4Ghz @ 1.4v and I've been getting BSODs nonstop. Only way to keep it stable is to raise it to 1.5v. I have copied Sin's settings exactly and it won't boot unless I put it in 1.6v. Running Corsair CMGTX3s so these settings are a walk in the park for them. Not sure what else can be done. Hard drive is definitely not responsible for the crashes as it isn't an SSD.

On the bright side, all of this won't matter anyway because I'm going to run my chip at 1.6v. 8170 is coming out next year so all I have to do is make it last 4-5 months. If this dies within the next month, I'm upgrading to an SB-E.
Edited by Cool Vibrations - 10/18/11 at 8:29pm
post #75 of 228
Quote:
Originally Posted by CTM Audi;15351719 
http://www.kitguru.net/components/cpu/zardon/amd-fx-8150-black-edition-8-core-review-with-gigabyte-990fxa-ud7/24/

Its an issue with Gig boards, the BIOSes just arent good yet. Ironicaly, same issue Im having with my MSI Z68A-GD80 G3, keeps throttling when OCing, but at least it only throttles down to 4.2Ghz instead of 2.8 lol.

That explains the 2.8GHz downclock.
*sigh*

So now we need LLC and an option to disable APM.
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post #76 of 228
Quote:
Originally Posted by Evil Penguin;15362926 
That explains the 2.8GHz downclock.
*sigh*

So now we need LLC and an option to disable APM.

According to this post, APM can be disabled in AMD OverDrive. It's weird that the option isn't there in BIOS yet, but maybe this workaround will work in the meantime.

And yes, LLC is a must. I really hope that Gigabyte makes it publicly available soon.
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post #77 of 228
thumb.gif "I will use this information when I get my Bulldozer in - thanks for the info!"

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post #78 of 228
Nice write up but with that cooler and 1.58v what were temps? Its so hard staying under 55-56c on prime lol
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post #79 of 228
Thread Starter 
Quote:
Originally Posted by CTM Audi;15351719 
http://www.kitguru.net/components/cpu/zardon/amd-fx-8150-black-edition-8-core-review-with-gigabyte-990fxa-ud7/24/

Its an issue with Gig boards, the BIOSes just arent good yet. Ironicaly, same issue Im having with my MSI Z68A-GD80 G3, keeps throttling when OCing, but at least it only throttles down to 4.2Ghz instead of 2.8 lol.

it can be disabled and just not available for change on the UD7, as most of that stuff on all UD7s are disabled. When I OC i get no throttling, i did with an earlier BIOS, but after i updated i get none.

1.58v? where did i do 1.58v? that shot at 5.3ghz was just a max OC, not stable
    
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post #80 of 228
Great guide, +rep. My thought is that BD is paving the way (pun intended) for some really great products. I'll jump back to AMD on my next build if AMD gets BD and the software environment where it needs to be. Here's an observation on your OC stability disclaimer:

A good friend of mine is a EE who works on a CPU developnment team for (what was once) Sun. I asked him about overclocking and he replied: "There cannot be a truely 100% stable high OC. There are things going on at boundary conditions that a high OC screws up and there is no getting around it."
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