New Rig Question

[merlin3650]

I want to start a rig like DennisD7. For those who don't  know, a motherboard (mini-ITX). I was wondering, exactly how much role does this play in mining? I found a Dell  optiplex GX270 on ebay that uses a P4 processor for alot cheaper than what the Dennisd7 rig would cost me.

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[lyth0s]

Can you post his rig?

[fractalbc]

Older P4 rigs typically draw significantly more power than newer rigs.  An old P4 will often idle at 60-80 watts.  A raspberry pi idles at 3.  An i3 idles at 20.

Everyone here talks about ROI.  Return On Investment.  How long will it take to pay for a lower power rig with the reduced electricity bill.  If that number is bigger than your attention span, then buy the power hog.