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 Mhz.
80486 (>33 Mhz) : Fanless Lasanga heatsink or just passive heatsink.
80486 (75 to 133 Mhz) : Small Heatsink with 2000 RPM Fan.
Pentium (60 to 75 Mhz) : Passive Heatsink, but tall.
Pentium (75 to 233 Mhz) : Small Heatsink with 2000 RPM Fan.
Pentium II (233 Mhz to 450 Mhz) : SECC1 Package w/ 2000 RPM Fan.
Pentium III (Non-Coppermine) : Same as P2.
Pentium III (Coppermine) : Medium Heatsink with 2000 RPM Fan.
Pentium III (Tulatin) : Medium Heatsink with 2000 RPM Fan.
Pentium 4 (All) : Large Heatsink with 5000 RPM Fan.
---
OK.. Now some speculation as to what will come in the "Retail" box for future Intel CPU's.
Please forgive me for not using the proper "Codenames".
Pentium 5: Large Heatsink (Maybe Swiftech Style?) with Dual 7000 RPM Fans.
Pentium 6: Complete Watercooling setup, complete with Radiator, Pump, Hoses and Waterblock.
Pentium 7: Dedicated Vapor-Phase Cryogenic Cooling unit. (IE. Kryotech)
Pentium 8: Dual Dedicated Vapor-Phase Cryogenic Cooling unit. (One unit used to cool the other.)
Pentium 9: Specialized Room-Size Absolute Zero Cryogenic Cooling Unit. (Microcomputers will
become Mini-Computer sized again just to accomodate the cooler!)
Hmmm... Again, just some speculation... I didn't go into Athlon CPU's because they are
already emitting obscene amounts of heat. (75 watts? Eeek! CPU or Blast Furnace?

)