I intended to load Ubuntu Linux and make this a dual boot machine. Can't be done without major tweaking of Windows registry and changing BIOS to AHCI boot. Why? Because new Intel Optane SSD memory is installed. It uses Intel's proprietary Rapid Storage Technology (RST) that requires Windows services to run during startup. I've read this SSD memory won't even work with AMD processors. There are various fixes online but nothing is guaranteed to work. Regardless, if I succeed in loading Linux I must give up the advantages of Optane memory. Even having said all this, as a purely Windows 10 machine this appears to be a nice, fast machine and is good value for money.