Well, I have a compaq presario v3700 which is a laptop for assignment, browsing the internet, movies and stuff but it would lag tho when opening viewing some HD video in youtube, so I'm thinking whether i should overclock it, I mean, overclocking a laptop might be uncommon as compared to desktop considering desktop has good cooler such as water tubes and ridiculous amount of fans while laptop can only rely on cooler with fans underneath it.

And now i bought a new alienware, it is designed for gaming so i assume it has good cooling system in it, so should i overclock both of my laptops? i might buy a good rm100 cooler for my alienware and then overclock it. Will overclocking both by my laptops shorten their lifes significantly? I know it will shorten their life somehow somewhat but i want to know will the impact of overclocking a laptop, i might want my alienware to last for at least 4 years from now on. Im planning to overclock both CPU and GPU

this is my 1st time knowing about undervolting. If i undervolt and get a good cooling pad for my alienware, do u think i can overlock my aw?