I have an old MacBook Pro (2.66GHz IntelCore2Duo; NVIDIAGeForce320M256Mb; 2x4GB1067MHzDDR3; 500GB) that was accumulating dust on a shelf. I wanted to sell it to buy a @Raspberry_Pi to run  node with @getumbrel. Then I though... why not just run the node in the old Mac?