Intake fan...any difference?

Yes it is always important.

I have two intakes front of the case and three exhaust, 2 in the back and one on the top of the case.
 
yeah, airflow is important. intake in the front, exhaust in the back. pretty simple concept, but effective none the less and necessary even more now a days with higher temps.

My computer from 3 or 4 years ago had 1 intake and that was it, and it still survives today as a part of a network.

Current setup in my antec case uses 2 80mm intakes and 2 80mm exhaust.
 
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