The Solaris on Dell PowerEdge servers wiki lists all of the hardware platforms that Dell supports Solaris 10 with. Note that there is nothing newer that 11th-gen hardware listed, nor any support for Solaris 11 (seems that no validation testing has been done by Solaris for a while now). Your R730xd is a 13th generation system, so you won't find this driver officially provided by Dell.
However, with some quick web searching, you can find that the PERC H730p uses the LSI 3108 ROC... and so does the LSI MegaRAID 9361-8i card. The LSI Support Site shows plenty of drivers for the card, including one for Solaris 10 & 11.
The Solaris on Dell PowerEdge servers wiki lists all of the hardware platforms that Dell supports Solaris 10 with. Note that there is nothing newer that 11th-gen hardware listed, nor any support for Solaris 11 (seems that no validation testing has been done by Solaris for a while now). Your R730xd is a 13th generation system, so you won't find this driver officially provided by Dell.
However, with some quick web searching, you can find that the PERC H730p uses the LSI 3108 ROC... and so does the LSI MegaRAID 9361-8i card. The LSI Support Site shows plenty of drivers for the card, including one for Solaris 10 & 11.