8088/8086: Air Cooling, no heatsink, barely warm to the touch.
80286: Air Cooling, no heatsink, warm to the touch.
80386 (16 to 33 Mhz) : Air Cooling, no heatsink, hot to the touch.
80386 (33 to 50 Mhz) : Air Cooling, no heatsink, I'm not touching that.
80486 (33 Mhz) : Same as 386 running at 50...