I have a set of hex screwdrivers, different sizes, but I'm wondering if its necessary to buy Torx keys. Will they be necessary or will hex drivers be sufficient?

Thanks

you may find one that will fit, but be carefull becuase it strips the screws easy.

You only need a torx 10 and a torx 20 driver and you should be able to get them dirtcheap @ your local gasstation...

A torx 15 is also needed to remove the HDD from the HDD tray. Why does everybody always forget that?

i didnt have any torx screwdrivers and i was too lazy to go out and buy any, so i made do. I used an allen key to open the box, an allen key to remove the hdd tray and an allen key to remove the hard drive from the tray.

Wasnt exactly a "quick" job using a friggin allen key, but i made do...without stripping the screws either!

yeah, not all places call them "torx" bits although that is the proper name. Just use the star shaped drivers, they say the size on the bit usually, you want a 20 for the case, a 10 for the internals, but a 15 for the hdd. Many people use 10's for the hdd and you end up screwing it up, and loosing the thread. Trust me, if your gonna use a t10 on the hdd, be very careful as you will probably round it off.