05-08-2013 03:39 PM
The LGA 775 socket is a desktop socket, so I'm guessing you're talking about a desktop processor needing a new fan.
That said, the best thing to do would be to contact HP Support - 800-474-6836 - and get a new fan that is designed to work in your system. Third-party fans are available, but their compatibility with your system cannot be guaranteed.
I am an HP employee.
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