Was just gifted a few old iMacs, worth trying to upgrade?

[sekker]

That 27" iMac has a LOT of honestly easy internal solutions. Some here:

https://eshop.macsales.com/shop/ssd/owc/...-inch/2010

What I did for a similar 21.5" was to replace the optical drive with an SSD and use that for boot, and use the internal spinny drive as a time machine backup. All-in-one.

Then use OpenCore for a more modern Mac OS.

https://appleinsider.com/inside/macos/ti...g-opencore