If I'm stuffing 8 hard drives into a case, I would buy a case with more suitable airflow options for the drives such as larger in take fans situated on the front to cast air over the drives to dissipate heat.
http://www.newegg.com/Product/Product.aspx?Item=9SIA0AJ2J51706I have an earlier version of this case and it does exactly this. Also space for up to 9 3.5" drives....I also paid a lot less for the earlier version one. You might need to look around if you want a non-ridiculous price.
i'm asking if I need to
I suppose its possible to contruct a laptop yourself?
As far as i know, not yet. There's a reason why when people ask for laptops nobody says "build it yourself".
which is better, my current one (this: http://www.asus.com/ca-en/Graphics_Cards/ENGTX560_DC2DI1GD5/ )or this: http://www.newegg.ca/Product/Product.aspx?Item=N82E16814487028and if it's better, what kind of performance boost can I expect to get
Not much of a Computer Guru, but im pretty sure its just a regular computer drives and CPU compressed into a portable computer? If I am wrong, then laptops aren't really a good choice of construction at all costs.
not at allin many cases the only replaceable components in a laptop are the ram in the hard drive, both of which are smaller than the "normal" counterparts