I've got a Lanparty, I run 250MHz FSB.
Same stock passive cooler on NB and SB. Nothing added to mosfetts.
Although I did put some AS3 under the NB heatsink.
And that NB heatsink is ROUGH! I was stunned by how horrible the base was. It's BAD. I'm probably going to lap it later. If I can't lap, then I'll at least do some 400 grit on it until it's semi flat.