Originally posted by Knuck1ez: It is fine.... but I would advise against it. Newer cases have better cooling which you need for a gaming computer.
That all depends on the case...I've got one from about 10 years ago that has better cooling than most modern cases. Also, if you have a dremel tool, any case can have great cooling.
I generally don't recommend you use an old case for a gaming PC unless you intend to modify it heavily. Newer cases use the updated ATX form factor, will cool better, and are better able to fit the parts.