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Having trouble with GA-990FXA-UD3 overclock

post #1 of 6
Thread Starter 
I just took the plunge, and bought a system that I can OC a bit.

GA-990FXA-UD3
FX-8350
Corsair H80i cooling

http://www.overclock.net/t/1140459/bulldozer-overclocking-guide-performance-scaling-charts-max-ocs-ln2-results-coming

I am using that as a guide but am having trouble in several areas. I am hoping someone may be able to help out and point out the things I am doing wrong or misunderstanding.

First off, I start off from a load optimized defaults. I'll turn off what I assume to be all the things that could play havok. Cool & Quiet, SVM, all the things that look like 'hey this will automatically adjust the CPU'. (this is one of the problems, under load, the system switches multiplier and vcore once ever few seconds)

I have the multiplier set to 22.5 for 4.5GHz speed. I also set the vcore to +.050 for 1.415v in BIOS. I stepped down from the 1.45 in the article as running the test got me too close to 59 degrees C when I shut down the test.

I notice that the multiplier (CPU-Z) shows x 22.5 (7 - 23.5) and as I am running my tests for 10 minutes, the multiplier will bounce down to x7 and back with ever increasing frequency. The package temp is 55 c. (HWMonitor)

The test package is HeavyLoad only running the the CPU test. I can run this test successfully for 10 minutes (note i was using prime95, but I was reading that it's does play nice with my proc.)

Now, if I go further in that article, when I go back to BIOS and start reducing voltage (vcore) till I cant post - once I can't post and the gigabyte MB reverts to a working bios setup, I cannot find ANY vcore settings that will work in the bios. It always tells me that there was problems booting blah blah. I have to load optimized defaults and then start all over. Am I missing something?

Best regards and thanks for looking!

Rick
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post #2 of 6
Thread Starter 







various BIOS screens - to show settings.
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post #3 of 6
Whoa dude! You have the same setup I had and I hope you have not already damaged that UD3.

What is happening is the VRMs are overheating and throttling back the CPU. If they get hot enough they will warp the board, which will pull them away from the already inadequate VRM heat sink. That means the overheating will only get worse, and also the throttling.

This is what throttling looks like in OCCT. This is on an already warped board with a Thermalright HR-09U type 2 heat sink added. That moved the throttling from 59C to 64C as shown.


On mine, for OC I settled on a multiplier of 22.5 with volts +0.025 for a stable 4.52ghz. I also turned off all of the power saving thingies.

What you need to do to stop the throttling is put a fan directly on that VRM heat sink. Some people use the fan from the stock AMD heat sink, while others stick other fans in there, while some go as far as watercooling them.

I would suggest you go here and quick scan the last 200 pages or so
.http://www.overclock.net/t/1023100/official-gigabyte-ga-990fxa-series-owners-thread-club
Blackie
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Blackie
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post #4 of 6
Thread Starter 
When you say 'put a fan directly on that VRM heat sink,' do you point a fan on it, or do you mean attach a fan to it? With the corsair water cooler, the radiator is covering the VRM heat sink.

The VRM heat sink is pointed out here as 8+2 phase power design correct?

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post #5 of 6
Yes. biggrin.gif

Some people zip tie a fan in front of it and some bolt a fan directly onto it. The radiator is covering it? That is not good.

Post in the thread I linked to and you will get help from others who have already gone through this. I am on air so can't help you much more.
Blackie
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Blackie
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post #6 of 6
Thread Starter 
thanks for the help
Alpha
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Alpha
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AMD FX-8350 990FXA-UD3 NVIDIA GeForce GTX 560 Ti  NVIDIA GeForce GTX 560 Ti  
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