Network card as in ... ethernet card you mean. Of course you'll have to purchase them. How else can you connect computers? I'm no expert on this but, you'll have to connect all of them together (using the hub) and set up a LAN. Neutron's tutorial tells you exactly how to set it up using DHCP. If i'm not mistaken, there was a post on how to start them up using just one clusterknoppix CD...ah... here it is:

http://www.antionline.com/showthread...r=3#post798004

Anyways, as far as I can see, this cluster can be used only for cracking passwords. I don't see any other use for them. If you're planning to do some sort of 3D rendering or something, the software will probably not work on your ancient computers.

Also, each node is a full blown computer. It will consume power (albeit small, if they are old ones). If you've got time (and money for network cards) try it out for fun, but that's just about how useful it'll be to you.

Just my 2 cents.

Say... can we make a cluster for windows? It'll help a lot if we can cluster windows and play doom3 or HL2 . That'll compensate for the graphics card AND RAM.