BIOSTAR Intel 300 Series Motherboards Support 9th Generation Intel Core Processors
Used - Like New: ASUS PRIME B360M-A LGA 1151 (300 Series) mATX Intel Motherboard - Newegg.com
MSI PRO Z390-A PRO LGA 1151 (300 Series) Intel Z390 SATA 6Gb/s ATX Intel Motherboard
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Alleged MSI tech support email states older 300-series motherboards won't support AMD Ryzen 3000 processors - NotebookCheck.net News
ASRock > Intel 300 Series
Asus Prime Z390-A LGA 1151 (300 Series) Intel Z390 HDMI SATA 6Gb/s USB 3.1 ATX Intel Motherboard - Walmart.com
Gigabyte has optimised their 300-series motherboards for Intel 9000 series processors | OC3D News
Here's A Roundup Of Intel 300 Series Coffee Lake Motherboards From ASUS, ASRock, And Gigabyte | HotHardware
AMD says it's exploring adding Ryzen 5000 support on 300-series motherboards | TechSpot
Amazon.com: ASUS Prime Q370M-C/CSM LGA1151 (300 Series) DDR4 DP HDMI VGA SATA 6GB/s USB 3.1 Gen2 MicroATX CSM Motherboard : Electronics