9th and 8th Generation Intel® Core™ Desktop Processors use an LGA1151 socket. However, they require motherboards based on Intel® 300 Series Chipset. Some Intel® 300 Series Chipset based motherboards may need a BIOS update to support 9th Generation Intel® Core™ Desktop Processors. Please check with the motherboard manufacturer for details.
Similarly, 7th Generation Intel® Core™ Processors and 6th Generation Intel® Core™ Processors aren't compatible with the Intel® 300 Series Chipset motherboards.
The Desktop Intel® Core™ processors 6th and 7th Generation support both DDR3 and DDR4 memory. The Desktop 9th and 8th Generation Intel® Core™ processors supports only DDR4 memory.