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About VRMs & Mosfets / Motherboard Safety with 125W+ TDP processors - Page 67

post #661 of 1100
Quote:
Originally Posted by Kokin View Post
I was just talking about idle/normal activity... I've felt the heat coming from them during IBT/LinX and I didn't even want to touch them.
they won't bite...they'll just give you 3rd degree burns
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post #662 of 1100
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post #663 of 1100
Quote:
Originally Posted by mikepahl318 View Post
Wow all MSI
And most of them Nikos based.
   
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post #664 of 1100
Thread Starter 
This just in: it is inductor quality that defines quality VRM system or not
Simply put you either need really high quality inductors with high rating (1 per phase) or a more reliable 2 per phase, whether the rating is the same or lower. This may explain why MSI boards with NIKOS MOSFETs fail a lot... meanwhile you have boards on ASUS, Biostar, etc. using NIKOS MOSFETs and they don't fail often. I never thought the chokes'd be something we overlooked.

The theory of which board to choose stays the same throughout. For high TDP processors, quality 4+1 power phase (quality inductors is the culprit, perhaps not MOSFETs) or 8+2 power phase will remain by norm; however, the new thesis makes it more evident that 8+2 power phase does make a difference and is the end winner. As long as the inductors are not rated stupidly low (which is still unlikely).

I'm trusting this guy, he seems to have a lot more hands on experience and knowledge in VRM systems than I do or most of us.
post #665 of 1100
I couldn't really understand most of the stuff he wrote.

So basically low quality chokes (e.g. low rated current) = malfunction of chokes which starts storing energy = sending too much power to vrms = explosion?
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post #666 of 1100
Thread Starter 
It does seem so. If the chokes get too much power going through them, it either hits the chokes or backfires onto the MOSFETs; the latter happens most often, perhaps that is why we blame it on the MOSFETs more than chokes.
But how to tell choke quality easily if this really were true?
post #667 of 1100
Definetelly low quality MOSFETS (low amperages at 100 Celsius ,low thermal disipation) + low quality coils = VRM failure.

Too bad i don t have a thermometer to measure the temps on the 790XT-G45 VRM .It s amazing how the VRM heats up even with the 550 BE at stock ,compared to the 770-UD3 for example.
And i have the feeling that the capacitor values are too big also ,stressing the VRM even more (swithcing power supplyes don t like to much capacitance on the output ) .They added more capacitance to compensate for the low speed swithcing maybe ,to avoid voltage drops.

What to say ,the VRM on MSI AMD mobos sucks ,noob engineers
Or the manufacturer (beeing MSI factory or 3-rd party) uses equivalents , instead of what was designed/meant (for beeing cheap of course).
   
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post #668 of 1100
Well, I was going to test my 965 C3 at 4.5ghz on a MSI 790FX-GD70 however I think I might pass on that
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post #670 of 1100
On dice/ln2? Or air?
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