Is that stable under dual prime / dual 32M Dumo? I have noticed that the stock cooler does not cut it when doing dual pi / dual prime stability testing...

My Dual Prime would keep crashing out on me due to heat. I don't know how accurate the temperature sensor is, but after 2x Prime crashed, I felt the heatsink and it was burning HOT. That small hsf can't dissipate the heat fast enough when both cores are at 100%. I ended up slapping a P4 IHS onto my Yonah, then used a beefier cooler. With the stock heatsink, it was only dual prime stable at 2.4GHz, as opposed to 2.65GHz which is completely stable now