it is hard coded in DSM. since DS3612xs is sold only with i3 processor then there is no need to to find proc type and display other than i3, so programmers hard coded this info.
about system for DS415+. i found that its possible to install DSM for some RackStations, like RS3614xs+. i think so any DSM from segment 'Large scale business' will work, but not luck with DS415+