Just put together an opteron 146 and msi neo2 combo. The chip was a retail pib. The idle temp is 43C degrees and a sandra burn in had a 50C max, that's on stock timing and Vcore. I was looking around before I bought the cpu and saw people reporting temps 10 degrees or so less, I think my XP2000 was less than that. I wondered what others with a stock heatsink are running?