Someone I work with had an issue with his motherboard. He called a certain company for the replacement. He received the new board along with a new fan and heatsink. When he opened the box for the heatsink we were a bit surprised to a see a ROUND heatsink. He was a bit cautious about putting it in, I told him it should be fine and it may even be better with air flow.
If anyone out there has anything to contribute please do!