I mean I've heard they run warm as well, but I've never heard it in the "OMG it's going to catch fire!" sense. I bet you get good enough air flow through your 900 to keep air going through that mosfet sink and keep it at respectable levels.
Thank you all for your help. And I think I may have gotten things mixed up a bit.
The cooler would be for the Southbridge, which would leave the NB and mosfets with the factory hsf.
Also, I can get that cooler at my local CompUSA for the same price, so I don't have to worry about shipping. I'm just wondering if I'll need it at all. Although I do like that idea of a smaller fan blowing on the stock SB hsf. I think that's what I'll do first.
fans always work wonders! you'll notice 10-15c drop for SURE. but I recommend the thermalright NB and mosfet coolers. you can mount a fan on it also and it'd look better. that adds about 45(NB+MOSFETS) bucks to your cost but they look badass! here a pic of my rig. with the fan I run the NB at 1.61 volts and the temps dont go over 40c. now i need a fan blowing on the mosfets to keep the system stable(45c with fan, 75c without!), im going to be upgrading to some thermalright mosfet coolers as well. passive just dont work well when you're throwing lots of volts around!
if you're not going to OC all this is a nonissue. or if your going to OC lightly it's also a nonissue.
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