I wouldn't be sure sure that a decade old Intel ATOM CPU would compare favorably to a modern ARM CPU. Also, the optiplex would use more power, which might even

I wouldn't be sure sure that a decade old Intel ATOM CPU would compare favorably to a modern ARM CPU. Also, the optiplex would use more power, which might eventually negate the savings from buying a power supply and case for the pi. http://www.toughdev.com/content/2018/01/dell-optiplex-fx160-intel-atom-230-tiny-desktop-pc/ http://www.toughdev.com/content/2018/01/dell-optiplex-fx160-... suggests 15-20 watts.