Hello here is the intel homepage:https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProductFamily=Desktop+Boards&ProductLine=Intel%C2%AE+945+Express+Chipset+Family+Boards&ProductProduct=Intel%C2%AE+Desktop+Board+D945GCZYour mainboard is using the LGA 775 socket.The heatsink fan looks like this:
The fan can still be bought in a computer store, online shop or a repair shop.I will recommend to but a better fan, like the brand
northq, because the standard fan is difficult to mount correctly on the mainboard.Remember to add a bit of
cooling paste on the cpu, before you mount the fan.Good luck