XPS 8930, added 3rd party RAM, trying to enable XMP

In the BIOS, 'Performance Options' doesn't seem to be selectable (is greyed out). Also tried the Intel Extreme Tuning Utility, but for some reason, Advanced Tuning lists only Core/Cache/Graphics, but not Memory (where I believe is where the XMP setting is supposed to be). Any idea? Some background - machine came with 8GB (with a single memory stick from apparently Samsung according to CPU-Z). Added a Ballistic Tactical, which said it's also DDR4-2666 but seems to be running at 2400 according to CPU-Z). So from my googling XMP is what I should use to have it run as it should. Is the problem that the Samsung says 'No' for XMP? (even though that one is running at the speed I want...) Socket 1 ID = 0 Number of cores 6 (max 6) Number of threads 12 (max 12) Name Intel Core i7 8700 Codename Coffee Lake Specification Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz DIMM # 1 SMBus address 0x51 Memory type DDR4 Module format UDIMM Manufacturer (ID) Samsung (CE00000000000000000000) Size 8192 MBytes Max bandwidth DDR4-2666 (1333 MHz) Part number M378A1K43DB2-CTD Serial number 243CB695 Manufacturing date Week 46/Year 18 Nominal Voltage 1.20 Volts EPP no XMP no AMP no DIMM # 2 SMBus address 0x53 Memory type DDR4 Module format UDIMM Manufacturer (ID) Crucial Technology (7F7F7F7F7F9B0000000000) Size 8192 MBytes Max bandwidth DDR4-2400 (1200 MHz) Part number BLT8G4D26AFTA.16FBD Serial number A32BBFF2 Nominal Voltage 1.20 Volts EPP no XMP yes XMP revision 2.0 AMP no