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Chips are hot

S

Sniper82

Lifer
Not sure what there called but the chips with 3 legs and are black thats around the capacitors on my mobo are blazing hot at times. I put some homemade ramsinks on them but their still very hot to the touch. Can't keep my fingers on them long. Some are hotter than others.

This normal?
 
Sounds like mofsets to me.

Cheaper boards use 2-3 phase mofsets while more expensive boards use 4 phase ones. 4 phase ones produce a lot less heat and are "more stable".
 
They can get very hot. You have them in your PSU too.

Pretty much any electronic device has them.

Becarefull with the heatsink, though. Depending on the type and model the places were you screw them into the board may or may not be part of the electrical circuit.
 
This safe or should I look into getting better cooling on them. Of course I guess it would have to be safe since I am sure the manufactures wouldnt release boards like this. Its a Epox 8RDA+ BTW.
 
Long IR thermography reveals case temps of abridged foil trail sunk TO-220 devices approaching 90 degrees Centigrade. Hot to a finger but you must realise that the manufacturer of these devices will frequently publish a maximum SOA junction temp that is considerably higher. Breach that (very unlikely unless you're a real over-everything user!) and you'll know immediately as it's quite catastrophic and quick.

Cheers!
 
yeah I'm overclocking. Should I look into better cooling on them? The homemade ramsinks I have on there are aluminum blue coated and some of them are a very light purple because of the heat. When hot they sure ain't blue.

What kinda cooling would you all recommend? Or is it because my mobo just can't handle the o/c?
 
how much are you pushing it, if its not effecting stability i wouldn't worry about it. but there is a small chance that they are getting too hot and you could overclock further if you cooled them properly.

those ram sinks, did they use thermal tape? if so they should be fine if the grates are deep enough.
 
Handy hint - don't short out your MOSFETs, they don't live long that way. 🙁

Killed a nice Abit BX6-r2 board that way. Any idea how hard it is to get and re-solder replacement ones? Should I replace the caps too? I got a negative voltage reading out of the dead MOSFETs, and I've heard that reverse-biasing electrolytic caps, even once, can damage them.

I really liked that board, it served me well for so many years... I was really sad to have killed it. (Tualatin wire-mod gone bad - I wire-jumpered the socket for a vcore mod, and then when it still didn't boot, started changing the vcore jumpers on the slotket too. Must've somehow wired CPU Vcc or Vpp to Gnd, fried the board, CPU survived fine strangely enough. CPU heatsink got hella hot in hella short time.)
 
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