The maximum temperature recommended at the processor Integrated Heat Spreader (IHS) is 80 Celsius degrees.
The normal temperature range will be between 45 °C and 90 °C. Intel® Xeon® Processor D-1500 Product Family may not operate above +108 °C. I suggest you to add new thermal compound over the cpu metal plate.
Take a look into Supermicro recommendations. Check Chassis Notes
Supermicro | Products | Motherboards | Xeon® Boards | X10SDV-F
Thanks for the follow up. I guess I'll have no choice but to remove the heatsink and try and apply my own thermal compound to see if that improves things. I can only assume that Supermicro just did not do a good job of applying the thermal compound in the first place if these temperatures are high. I don't know how they expected the system to work with such a small passive heatsink, especially if the TIM application was not very good.
Thanks for the help, I'll try and remove the heatsink and do a reapplication.