VMware* ESXi 6.0 U1 is supported on Intel® Server Board S1200SPL using Intel® hardware RAID controllers. The compatible RAID cards are available in the link below:
Intel® Server Board S1200SPL (Sort by Compatible Products, left side menu in blue)
I am sending you the list of tested operating systems with the Intel® Server Board S1200SP Family
Additionally, according to the link provided by you, VMware* ESXi 6.5 is already supported on this board; however, it is necessary to use an Intel® Xeon E3-1200-v6 (page 415). RAID configurations still need hardware RAID controllers.
If you require any further information, feel free to contact me.