I am using a Dell of a similar time frame as the hard wire computer to access router at my relatives place. It's the single core 3ghz model Pentium. Literally only used to wake the internet connection back up from time to time. Runs 10....I won't say "fine", but it's operational if you have the time.It booted w10 installer from usb on that PC. It works fine.
It doesnt have a hdd tho.
The newer 775 system has windows 10 on it sonce i found a dying sata hdd in my stash