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I want to to my RaspBerry Pi 4 with an old small CPU fan. However it's a 12V fan. Is it possible to use 2 of the 5V pins on the board to total to 10V? Sorry if this is a dumb question. I haven't worked with electronics in a while.

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    \$\begingroup\$ Two people walking side by side at 5 km per hour don't easily become one person walking at 10 kph. \$\endgroup\$ – Andy aka Nov 13 at 14:33
  • \$\begingroup\$ No it is not possible, both of the 5V will not only be referenced to the same ground but also come from the same rail (except for maybe a fuse or diode depending on where you get it from). \$\endgroup\$ – Wesley Lee Nov 13 at 14:34
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This is not possible as the two 5V pins are connected together and both referenced to the same ground potential.

Either you should look for a 5V fan or get a boost dc-dc converter to get to the required voltage.

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