Just as data points, I've got an Athlon 950-ASUS K7V using an Alpha P3125 and twin Delta 38cfm (loud)fans: idles at ~37C using the Asus probe drilled into the cold plate. I've also got an Athlon 600-ASUS K7M using a Gold Orb and it idles at ~41C with probe in similar location. Tack on approx +5C when under load (TFC, etc.)
😎