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Help! Mosfet cooling on GA-880GM-UD2H

post #1 of 12
Thread Starter 
Hi guys,

I was told in another thread to keep an eye on my mosfets due to my overclocking.

im at 4GHz with 1.4v and 2287MHz NB with 1.2v

the oc itself is stable, ive run prime & linx together for 3 hours and had no errors. i know ppl say to stress for longer but i never game on my pc for much more than 2 hours a night if im lucky smile.gif the mosfets are cool to the touch in idle of course, but after some benchmarking they are pretty hot to the touch... is this normal ?

my worry is, due to my case fans & H50, the mosfets on my board are getting no cooling at all. I have the Element T case which has a top fan blowing the warm air from inside my case out the top, and a push/pull setup on the H50 blowing air out the case. so the mosfets that are right in the corner are getting zero cooling.. even if i installed a good side case fan, the mosfets are kinda tuched away in the warmest part of the case.

is there anyway i can position some sorta case fan that i can aim in that area ? and maybe some copper heatsinks too.. but im thinking heatsinks alone wont do much in terms of cooling as the heat will stay in that part of the case ?

any help would be great smile.gif
post #2 of 12
enzotech mst-88 might we both have gigabyte boards fit its fits my board like a glove but there norm in high demand and out of stock everywhere id recomend adding something to them
post #3 of 12
If you were able to add onto the H50, you could get the WMST-88 from Enzotech, as it would fit the same as the air version mentioned above. Otherwise, it seems the Enzotech VRM heatsinks are a viable option. Newegg had them once upon a time, but now seems to have only the waterblock version. Looking in the shopping section of Google shows Frozen CPU (which is out of stock). How handy are you with an old heatsink and dremel?
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post #4 of 12
I stuck some of the heatsinks from this Accelero kit on mine. Seems to work fine, though I had no problems before. Only 8 bucks and I still have lots of heatsinks left over. I don't know what to tell you about airflow though.
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post #5 of 12
Thread Starter 
thanks for the replys guys.

airflow is indeed my main problem. ive seen somewhere (but cant remember where) a case fan that can be angled to any position you want, maybe thats what i need on top of some heatsinks.. the stock cpu cooler before atleast blew some air around that area.. but now ive got the h50... they've got no air flow what so ever.

im looking at my temps in HWMonitor.. what do you make of these..

Idle
TMPIN0 30 deg c
TMPIN1 31 deg c
TMPIN2 31 deg c

Load (IntelBurnTest - High)
TMPIN0 30 deg c
TMPIN1 59 deg c
TMPIN2 60 deg c

does this look high to anyone ?
post #6 of 12
I'm not sure what components those temp probes equate to, but I know a lot of mosfets are rated up to about 100C. I would say 60 and under is nothing to worry about. I've never heard of a mobo having a temp sensor for the mosfets, but I have an old one. I would think you would have to measure with a temp gun. I would just put some heatsinks on and see how hot they feel while you're under load.
Edited by The_Punisher - 2/24/11 at 2:33pm
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post #7 of 12
I had similar temps on my Gigabyte board (sig rig). While I know the chipset is rated for 80C, I wasn't sure of the MOSFET temps. I also know that transistors operate better, and more efficiently, when cooler. They also last longer, so I'm not opposed to cooling them well. Besides, even if they're designed to have a maximum operating temp it doesn't mean they're designed to constantly run near it. One thing has stuck in my head: 90C is around the temp a car's coolant is at.
The best example I can give is this (slightly related, in that it was electronic): Ford recalled millions of cars after several class-action lawsuits came against them regarding their ignition module. They were rated to run around 125C, and constantly ran there, causing erratic engine troubles, especially when warm. This affected almost every single Ford of the early-mid 90's. The fix? They put on one designed for higher temps...and I've seen those fail just the same. Moral of my story: keep it cool, and it will last longer, and perform better.
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post #8 of 12
Definitely normal... you're pushing an x6 high clocks on a 4+1 VRM. Thankfully you don't need much voltage to do it. I too recommend adding mosfet cooling before proceeding.
post #9 of 12
Not only should you add heatsinks, but buy a 60mm fan and use some heavy duty double sided tape to tape it onto the pump of your H50 so you have airflow blowing on your mosfets and/or MOSFET heatsink.

People think that having a heatsink is "good enough", but you need airflow still. I'm using the fan off my stock heatsink right now but that's cooling my Northbridge (dropped it from 55c to ~40c during gaming).

Oh and you should get these heatsinks. Your board does not have holes for push pins/screws.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835708011
Edited by Kvjavs - 2/25/11 at 8:35am
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post #10 of 12
Thread Starter 
thanks Kvjavs, will order those heatsinks this weekend and will check my local computer shop for a small fan to 'mount' somewhere inside the case and aim it at the mosfets.
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