My old PSU (before I got smart and bought a brand new Antec) was a 20 Pin for my 24 Pin, it still booted, granted I wanted to be safe and went with a 24 Pin Antec.
"Truth is violated by falsehood but outraged by silence."
"Mastering others is strength, mastering yourself is true power." ~Sun Tzu
"Ad Astra Per Aspera"
"Our greatest glory is not in never falling, but in rising every time we fall." ~Confucious
"The true measure of a man is how he treats someone who can do him absolutely no good.” ~ Samuel Jackson
“Omnis vir est fortunae faber”