I asked my professor about the pc and he told me that they bought them from Dell.But he also told me that the basic processing work for the program is done by a server computer(I saw the computer it was like a closet!)which communicates with the others.Now the weird thing is that they use parallel programming in order the other computers give to the server their processing power.

So I guess I have to buy a closet-computer and some normal pcs!

Well,you can't always have what you want!(House MD)

Anyways,thanks u all for your help.