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Multiplier Changing under load - Bulldozer

post #1 of 15
Thread Starter 
To start with, I have disabled core boost, cool n'quiet, C1 and C6 support. Almost all of my settings are set manually and I dont have any software interfering with my OC. I dont even have Easytune6 installed.

My system is in my sig and Im posting pics of my BIOS setting (apologies for the blurry memory settings screen)

When I put my system under load, especially in IBT, I will start out with my desired multiplier, say x19, then it will always drop to x14 for the majority of the test, then cycle back up to x19 again before the end of that cycle. It does it in CineBench as well as others.

I watch this take place in AMD Overdrive's CPU monitor (again, I have nothing set with overdrive) and the cores dont all uniformly drop in multiplier, they do it individually at random. When the multiplier drops, the voltage usually drops with it.

My system is running absolutely rock steady, Im just disappointed that my multi's dont stay constant.

Maybe these programs are meant to do this?

What do you think?
Dan

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post #2 of 15
Isnt the 990FXA have a UEFI bios?

Is it overheating? If all those power saving things are disabled it's either you disabled some phases (you can do that on MSI and Asus boards iirc) or it's overheating.
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post #3 of 15
Thread Starter 
Nope, 46C max under load with my water cooling setup. I am a machinist so I made my own waterblock and radiator. I have 2x120mm fans pulling through a pure copper radiator.
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post #4 of 15
potential vrm throttling. since its watercooled the vrm section could have inadequate airflow. try placing a fan over the vrm section or just see how hot they are when under load.
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post #5 of 15
Thread Starter 
Im going to run a test with a fan directly blowing on the VRM and Ill let you know how that goes.

On this train of thought, could I be running into underpower issues with my 630W PSU? Gigabyte calls for at least a 500W for this board. In all I wonder how close Im cutting it here.
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post #6 of 15
No you should be good on power supply, not even a big factor here since the video card is in idle.
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post #7 of 15
Thread Starter 
I tried an 80mm fan directly on the VRM and it changed nothing.

Nothing I've tried so far has worked, but heres a list of settings Ive tried so were on the same page.
Enabled and disabled core boost
Enabled and disable CPB Turbo
Enabled and disabled EOCP

With core boost enabled I've tried multiplier setting less than, equal to and higher than my normal multiplier setting.

When I enable core boost, no matter what the multiplier is set at, it sets itself at x17. then when I run the test, itll go up to what I set it to be(x19) then it will drop down to (x14) then near the end of the cycle again it goes to x19.

When I use boost my frequency font shows up in red where it normally is black.

Maybe I should try 1 previous BIOS and see how that works, or try the beta BIOS?
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post #8 of 15
If you aren't overclocked is it throttling?

Throttling is usually a power issue, which is why I initially thought VRM cooling.

Could be your psu with your watercooling setup just isn't providing enough while overclocked.

Or maybe an unstable rail?
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post #9 of 15
Thread Starter 
My water system is running off ac power so it isnt taxing my PSU.

besides my CPU RAM and board I have

2-120mm fans throttled less than half speed
3-80mm fans at about 2/3 speed on average
1-4 fan speed controller
2-250gb HDDs
1-8800GT not under load

This is coming out of a 630W Rosewill PSU

Im Overclocked right now to 4.07GHz


EDIT:
Richard, I missed your first statement, running a test to see, though I know that if I drop the HT Link to lower the overclock it still drops the multiplier.
Edited by DIY_dAn - 3/12/12 at 9:10pm
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post #10 of 15
Quote:
Originally Posted by DIY_dAn View Post


Richard, I missed your first statement, running a test to see, though I know that if I drop the HT Link to lower the overclock it still drops the multiplier.

I would try dropping everything back down to test. If it is throttling at stock its potentially unstable power, bios, or chip.

If its not throttling at stock bring your overclock back one step at a time and see when it starts throttling. Then you can at least narrow down the culprit.
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