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MSI MOSFET stress temps

post #1 of 4
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I know that MSI boards are know for having bad MOSFETs. I am about to run a Prime95 stress test but I want to keep an eye on my MOSFET temps, but I don't know what a good temp for it is... I ran a minute of stress and then I was like OH NO MOSFETS. So right now TMPIN0 idles at 25 and TMPIN2 idles at 29. CPU Idles at 30 @ stock w/ stock cooler. I wanted to know where MOSFET temps go on average when they are stressed out. When should I be worried?

I did order MOSFET heatsinks, they are on the way from newegg :/
Edited by Sauce Boss - 7/24/11 at 6:46pm
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5WAG
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post #2 of 4
Not sure if either of the temp sensors on that particular board point to the VRMs actually... it isn't consistent on all boards and sometimes that sensor isn't there at all
post #3 of 4
I can't comment on the quality of MSI's DR MOS design in terms of quality, but I will say my problem (blown FET) stemmed directly from the heatsink floating above the FET itself, without contacting it. I don't know if this has affected others, but I imagine that I'm far from the only one. The DR MOS design isn't just used by MSI; I know Gigabyte uses them, more specifically in a 890GPA-UD3H board, which I have experience with. That board has held up to a 140 watt 965 chip, and has worked for overclocking. The FETs are no hotter than the bigger brother 890FXA-UD5 board. Both boards use pretty much the same cooling setup in regards to the FET and NB heatsinks. I think that speaks volumes about the DR MOS design.

Now if MSI would make a proper-fitting heatsink, then perhaps we might have more reliable boards. The temps you posted are lower than the GB ones, which are 40sC on idle, and 50s under heavy load. This was especially true on the UD5, with traditional FET circuitry. Only water-cooling helped those temps, with the NB still reaching 40+ C under load. Either it was a faulty sensor (a whole slew of boards), or the chips ran hot.

I think you're doing just fine.
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post #4 of 4
I went and put 2 small washers under each screw that held my mosfet heatsink down on the board.
My vrms are really cool, I feel the back of the mobo where the vrms are and after 30min of prime 95 I can keep my finger on the back for more than 10 seconds so they must be around 120F but The chokes are producing way more heat I think.
i have run prime overnight with 1.45v granted I fixed the cooling on the vrms and have really good airflow.

Also your tmpin2 is your system temp which is nb temp
Edited by konspiracy - 7/25/11 at 7:59am
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