So you've got a nice shiny mITX X299 board and need some nice new DIMMs? Look no further! I've got a kit here with a base spec of 2666 MHz (that means no XMP needed), making it the perfect match for your new i9 CPU's default speeds, or with a CPU overclock (since memory overclocking affects CPU overclocking at times on this platform).
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips