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About VRMs & Mosfets / Motherboard Safety with 125W+ TDP processors - Page 53

post #521 of 1100
Thread Starter 
Whoops, I wrote it wrong there
But if I did time travel, I wonder what VRM failures I would see... perhaps I'd get a nice sneak peak at all the failures happening with the 125W AM3+ 8 cores
Actually with the majority of CPUs people are going to buy on AM3+ being closer to the lower TDP of 95W (i.e. the 4-core or 6-core variant - speaking strictly of cores, not modules), I think the VRM issue will fade a little and quality 4+1s like what Gigabyte is doing with some new boards will become a norm

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post #522 of 1100
I think that the main issue with current boards that they they are based on designs for 4 core processors, when X6 processors are much more strenuous on the VrMs.
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post #523 of 1100
Thread Starter 
Yes indeed. 4 module/8 core will be expected to be even more strenuous, but the improvements of 32nm and module-based architecture should really drive down the TDP very nicely to the point where it'll be a long way to go before it becomes an issue again.
It does make sense anyway... 4+1 phase... 1 phase per core, 1 for IMC; meanwhile it's a bit different splitting 4 CPU phases to 6 cores
post #524 of 1100
Phases v. Cores does not matter in the slightest, the power all goes to the same place. A multi-phase buck converter still has only one output.




Multiphase synchronous buck converter, which is what is used in motherboard and GPU VRMs.
post #525 of 1100
Long time lurker, and this thread convinced me to join. I'll be checking back with this thread once the AM3+ boards hit retailers for sure. Hopefully my 890GXM-G65 & 965 holds out that long. Thanks for the info guys
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post #526 of 1100
Quote:
Originally Posted by Phaedrus2129 View Post
Phases v. Cores does not matter in the slightest, the power all goes to the same place. A multi-phase buck converter still has only one output.




Multiphase synchronous buck converter, which is what is used in motherboard and GPU VRMs.
Yes, but the X6 might be more strenuous, with turbo core, and stuff like that, constantly upping, and lowering voltages. Might mess with VRMs some.

It is just strange because all but one of the failures on the 890FXA-GD70 are with X6s.
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post #527 of 1100
Quote:
Originally Posted by reflex99 View Post
Yes, but the X6 might be more strenuous, with turbo core, and stuff like that, constantly upping, and lowering voltages. Might mess with VRMs some.

It is just strange because all but one of the failures on the 890FXA-GD70 are with X6s.
If you're referring to the Hardforum, I do believe that was the original point of that thread... the fact that x6's were taking out boards. It just sort of evolved in to VRM failures.
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post #528 of 1100
Quote:
Originally Posted by Krusher33 View Post
If you're referring to the Hardforum, I do believe that was the original point of that thread... the fact that x6's were taking out boards. It just sort of evolved in to VRM failures.
not sure what you are referring to here.

Link?
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post #529 of 1100
Quote:
Originally Posted by reflex99 View Post
not sure what you are referring to here.

Link?
Talking about the thread xd linked? Title is "Post here if your board killed by Phenom II x6" or something like that.

Quote:
Originally Posted by xd_1771 View Post
A whole bunch more from hardforum are about to be added. But one particular one of note I would think is this one. The failure took out both the motherboard and the CPU. and the CPU. Looks like CPUs being killed due to fried VRMs is not impossible.
Link to the actual thread instead of just the one post xd linked: http://hardforum.com/showthread.php?t=1524927
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post #530 of 1100
Quote:
Originally Posted by Dromihetes View Post
I felt this like a hit in my useless head


Regarding the Nikos mosfets i can say that we all know that there is a market of fakes in this industry so there may be fake/d Nikos overthere .It s quite easy to rename ,rebadge etc.
On the other hand maybe ,maybe ,there are newer Nikos manufactured from real silicon A young brand like nikosem may be evolving.

My MSI KT3 Ultra2 lasted for 8 years beeing used like 14 hours a day in heavy usage ( as the Athlon Barton-s could ) and had not a single Nikos MOSFET on it

My humble opinion is that Nikos may be ok in areas were high ameperages are not needed , like driving a fan or something or some small chip.

I was astonished on how the VRM area heats up on my MSI 790XT-G45 compared to the Gigabyte 770-UD3 ,with the same "killer" CPU ,720 BE at stock

Maybe MSI engineers calculated the VRM-s for some other MOSFET characteristics and some moron in a factory decided to cut cost buy using those.

If you look at this AMD boards made by MSI you will observe they are also use ON transistors instead of Nikos or along them ,depending on the batch.

I have seen no ON mosfets burned on MSI mobos untill now or nobody that had them burned had not posted a picture.

So what gives if you only see Nikos burned in VRM areas ?!
They must be the culprit.

LE: I ve heard that capacitive loads on switching power supplyes outputs can overload them as well.
Maybe MSI engineers use to compensate vdroop "biger" capacitors on the VRM outputs ,
instead of using more VRM stages or a better quality VRM controller.
This may be one of the reasons they ve started using Hi-C cap ,the Tantalum ones.This capacitors have different characteristics and may help in avoiding overload when big capacitance is used.

Also mosfets have a frequency at which they switch properly.If this frequency is too high engineered so to compensate the lack of VRM phases ,they might start oscilating and make more heat.
Maybe this Nikos don t do well at specific frequencies ,like the ones MSI uses for their VRM controllers.
Refer to my thread.

http://www.overclock.net/intel-mothe...ts-my-r2g.html

Nikos can't drive a fan safely.
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