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Another MSI NF980-G65 story - Page 2

post #11 of 25
Quote:
Originally Posted by billy66bare;14360826 
No, unfortunately I have already sent it off. MSI also has no quick/cross ship option, and a 1 to 2 week turn around time. I need to get whatever they send me back and sold to help pay off the UD5. I can tell you the back of the board looked fine.

I could care less at this point. My only concern is that nobody get's hurt if one of these goes up and flames while someone is asleep. I'm no chemist/engineer, so I don't really know if they will always go out on their own, or could possibly keep burning and spread. Not to mention the chemicals burning in all of that. The RV smelled AWFUL for a few hours after, luckily the air has been on.

I have it in an Antec 900 with a Tri-Cool on high on the door, and the original exhaust Tri-Cool pushing air in, and the Big Boy up top on high as well as my 240 pulling in air up front. There was plenty of air flow over everything. The part that blew up wasn't covered by a heat sink. The extra little kicker is I had just replaced all the OCZ freeze on my heat pipe with IC7. Not the VRM sink, though. I didn't feel like trying to mess with tiny amounts of IC7. lol

what water block are you using?
post #12 of 25
Thread Starter 
XSPC Rasa. Why?
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post #13 of 25
Quote:
Originally Posted by Poisoner View Post
You have too much power supply for the build. Anyways, you took a gamble with overclocking, and an even bigger gamble with a mid range motherboard. Voltage is not what kills VRMs, it is current, as in amperage.
The current does not change on its own. But, increasing the voltage, it also increases the current, see ohms law. So by raising the voltage you increase the current flow which overloads the FET and makes it burn.
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post #14 of 25
Thread Starter 
So why would my PSU produce any more current than any other. They are all ATX spec right?
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post #15 of 25
Quote:
Originally Posted by cechk01 View Post
The current does not change on its own. But, increasing the voltage, it also increases the current, see ohms law. So by raising the voltage you increase the current flow which overloads the FET and makes it burn.
Ok that does not make sense because the vrms change the voltage from 12v and what ever amps to what you set your vcore to and amps that is required.

Oh wait nvm I get it now, it just increases the amount of amps to increase the amount of voltage when converted for cpu use, which in turn creates more heat for the conversion of high voltage and low amperage to low voltage and higher amperage.

Which means if you crank up the vcore the vrms need more amps to jump the vcore voltage up and makes the vrms hotter.

But wait dont you think that would have been under a heatsink if that vrm was for the cpu


Quote:
Originally Posted by billy66bare View Post
So why would my PSU produce any more current than any other. They are all ATX spec right?
It has nothing to do with your psu, he pretty much stated that you have a really high output PSU for such a low powered system.

You could of used a 430-500w psu and prob been fine.(if overclocked 550w would be perfect)
Edited by terraprime - 7/26/11 at 10:23pm
 
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post #16 of 25
Thread Starter 
Quote:
Originally Posted by terraprime View Post
Ok that does not make sense because the vrms change the voltage from 12v and what ever amps to what you set your vcore to and amps that is required.

Oh wait nvm I get it now, it just increases the amount of amps to increase the amount of voltage when converted for cpu use, which in turn creates more heat for the conversion of high voltage and low amperage to low voltage and higher amperage.

Which means if you crank up the vcore the vrms need more amps to jump the vcore voltage up and makes the vrms hotter.

But wait dont you think that would have been under a heatsink if that vrm was for the cpu



It has nothing to do with your psu, he pretty much stated that you have a really high output PSU for such a low powered system.

You could of used a 430-500w psu and prob been fine.(if overclocked 550w would be perfect)
For 2 GTX 470's and an Ph II 970? I'm doubting that seriously. I've been around a little longer than that. lol
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post #17 of 25
Quote:
Originally Posted by terraprime View Post
Ok that does not make sense because the vrms change the voltage from 12v and what ever amps to what you set your vcore to and amps that is required.

Oh wait nvm I get it now, it just increases the amount of amps to increase the amount of voltage when converted for cpu use, which in turn creates more heat for the conversion of high voltage and low amperage to low voltage and higher amperage.

Which means if you crank up the vcore the vrms need more amps to jump the vcore voltage up and makes the vrms hotter.

But wait dont you think that would have been under a heatsink if that vrm was for the cpu



It has nothing to do with your psu, he pretty much stated that you have a really high output PSU for such a low powered system.

You could of used a 430-500w psu and prob been fine.(if overclocked 550w would be perfect)
Look up Ohm's law for a better explanation .
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post #18 of 25
That MOSFET is on the single unheatsinked phase powering the CPU-NB circuit. Looks like you pushed that too far. It is the third transistor/"driver chip" so it looks like the same improper-sized driver problem as the 890GXM-G65. MSI definitely need to stop cheaping out with regular transistors and get some proper driver chips in there!

Using that MSI mobo with any high end high TDP CPU....not really a good idea.

I list all the VRM failures I found in my "About VRMs & MOSFETs" thread (see sig) and there are an overwhelmingly large number of MSI AM3 board failures, including on this particular board. Now listing both yours and 996gt2's situation so the uninformed can see the confirmed results and not make the wrong decision.

996gt2 I have one last thing to ask: What cooling did you use?
Edited by xd_1771 - 7/27/11 at 2:52am
post #19 of 25
Another one bites the dust. Man I hope Bulldozer is worth upgrading to when it finally comes out. Sorry about your experience, I am trying to take it easy (3.9) on this board and I will likely swap out the mobo for something a little more solid once I build the next rig and give it to one of my brother in laws.

What happened to the power connector lead that was right above it and did you have any collateral damage to other components?
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post #20 of 25
Did anyone actually leave the turbo core on and watch the voltage changes via cpu-z or openhardwaremonitor ? It already changes between 1.2-1.49v (Some boards even list 1.475v as default for 1090t) So even for a brief time, cpu itself gets 1.49v voltage on default settings Or does it only happen on my board ?
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