TiN_EEYou will be fine using faster rated modules at slower speeds.
TiN_EENo, G.SKILL DC modules are essentially two DIMMs on one PCB, requiring special receipe to work. They are not supported on EVGA boards.
TiN_EESupported 32GB memory list:
GenjoKoanTiN_EESupported 32GB memory list:No mention of the X299 Micro ATX 2. ?