I complained about the family's mid-2010 iMac running a bit hot, and BAM!
Got a late-2013 iMac today (only a month old), and it is running quietly and cool... go Haswell!!!
Did a restore from Time Machine backup (10.9.5 off 2010 iMac - as my 10.9.3 Install USB stick did not finish installation on two occasions - 10.9.4 was the default OS for this one). Fixed MS Outlook corrupt Identity rebuild error, activated a few bits of software, re-ran Software Update, and it is like nothing has changed.
Now, to get a massive SSD for the spare internal drive bay 
