https://www.asus.com/de/Motherboards/ROG-STRIX-B350-F-GAMING/specifications/ ganz unten steht es bei den Anmerkungen bzw bei dem Speichersystem vom AMD B350 Chipsatz :
Anmerkung
*1 PCIEX16_3 Socket shares bandwidth witch PCIEX1_1 and PCIEX1_3
*2 Due to limitations in HDA bandwidth, 32-Bit/192kHz is not supported for 8-Channel audio.
*3 Due to AMD Ryzen™ Processor limitation, More than DDR4-2666 is supported by one DIMM per channel only
*4 ROG GameFirst IV is only available for Windows® 10 64-bit.
*5 When a SATA / PCIE mode M.2 device is installed, the M.2 Socket shares bandwidth with the SATA6G_5/6 ports.
*6 When a SATA mode M.2 device is installed, the M.2 Socket shares bandwidth with the SATA6G_5/6 ports