Why Does Intel® Xeon® E Processors Have Limited Intel® Virtual RAID on CPU (Intel® VROC) Functionality Supported?

• On Intel's website, it is mentioned that Intel Xeon E-series level chipsets have limited functionality when utilizing Intel VROC, specifically stating: Intel® Xeon® E (No Intel® VMD. Limited functionality supported). 
• Unable to find detailed documentation regarding these limitations and their potential implications for performance.

Intel® Virtual RAID on CPU (Intel® VROC) provides enterprise RAID solutions for both NVMe* and SATA drives for enterprise servers and workstations.

• The Intel® VROC (VMD NVMe RAID) provides an enterprise RAID solution on platforms that support the Intel® Volume Management Device (Intel® VMD) technology.
• The Intel® VROC (SATA RAID) provides an enterprise RAID solution for SATA devices connected to all SATA controllers via the Platform Control Hub (PCH) configured in RAID mode.

The Intel® VMD technology is not available in Intel® Xeon® E processors, therefore the Intel® VROC (VMD NVMe RAID) portion of the Intel® VROC package is not supported in Intel® Xeon® E processors. Only Intel® VROC (SATA RAID) is supported in Intel® Xeon® E processors.

For more information about specifications for Intel® Xeon® E processors, refer to the product specifications portal at Intel® Xeon® E Processor.