Those are laptops. They are low drain processors, designed to operate without a fan. I hooked up a P4 once, luckily it wasnt mine, and forgot to plug in the fan and I turned it on. The HSF was attached, just no power to the fan. It overheated and kept shutting down. It eventually fried, even after the fan. 
A fan is a must, no matter what. I laptop would run far better with a fan, but it's not there for weigh and power and noise reasons. You NEED a fan on a CPU, simple as that.
A fan is a must, no matter what. I laptop would run far better with a fan, but it's not there for weigh and power and noise reasons. You NEED a fan on a CPU, simple as that.
