MY AMD 3200 64 since mods with case fans room temp 31 C idle 37 - 40 C under load (Civ IV) 53 - 57 C before my own design mods load was 60 - 69 C
My thermal grease is a **** Smith Unick not the best by far but the only one available at the time.
A good ventilated case helps, again mine was not till mods.