I thought when you have a particular processor, that processor needs a ‘particular’ heat sink/fan, but apparently there are one’s being sold, saying that they can be used with a selection of processors. Such as this listing headline …
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“Original Intel Heat sink Cooler Fan for Quad Core Q9550-Q9550S-Q9650 LGA775 New”
I while back I bought a heat sink/fan ‘thinking’ I was getting one for an Intel Q9650 CPU, but what I ended up getting was one that had “Q9550” printed on the box. It was new/unused, and came in the box that originally was sold along with the actual CPU. Thinking I bought the wrong one, I didn’t end up using it.
I don’t have any problem using stock one’s from Intel at all, just as long as the heat sink/fan listed in my above quote, is actually ok to use with a Q9650.