ASRock AB350 Pro4 AM4 AMD Promontory B350 SATA 6Gb/s USB 3.0 HDMI ATX Motherboards - AMD - Retail Number of Memory Slots: 4×288pin Memory Standard: DDR4 2667/ 2400/ 2133 PCI Express 3.0 x16: 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)* * Supports NVMe SSD as boot disks * PCIE2 will downgrade to x8 mode when A-Series APU is installed. 1 x PCI Express 3.0 x16 Slot (PCIE4: x4 mode)** ** PCIE4 will downgrade to x2 mode when A-Series APU is installed. ** If M2_1 is occupied, PCIE4 will be disabled. Onboard Video Chipset: Integrated AMD RadeonTM R7/R5 Series Graphics in A-series APU DirectX 12, Pixel Shader 5.0 Max. shared memory 2GB Three graphics output options: D-Sub, DVI-D and HDMI Supports Triple Monitor Supports HDMI with max. resolution up to 4K x 2K (4096x2160) @ 24Hz / (3840x2160) @ 30Hz Supports DVI-D with max. resolution up to 1920x1200 @ 60Hz Supports D-Sub with max. resolution up to 1920x1200 @ 60Hz Supports Auto Lip Sync, De...