Are Sony playing us?

Can anyone explain how Sony has managed to produce a slimline variation of PlayStations 2 3 & 4, without a fan yet retaining the same heat dissipation also apparently without loss of processing power and remaining as energy efficient? Is it incremental & clever miniaturisation or Is it worked out years before and therefore profiteering?

The PlayStation 4 Slim does have a fan, it is a laptop styled blower fan.

Also, processors are becoming more energy efficient and can do more without creating more heat.

oh, thankyou.