I have been since the very beginning end of 2008 and that time i mined bitcoin with nehalen i7 920 socket 1366, was amazing cause it was the first native quadcore with 8 threads, and yeah I have no clue what the hell i'm talking about it. Go look in the source code at how bitcoin was in the end of 2008 and now and look how eth was in 2015 and look now. I'm giving you hints, now is up to you to do your homework.