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* The PCIEX4 slot shares bandwidth with the M2P_32G connector. The PCIEX4 slot operates at up to x2 mode when a PCIe SSD is installed in the M2P_32G connector.
Mainboard Asus Prime H510M-K (Intel H510, Socket 1200, micro ATX ...
CPU: Intel® Core i5-10505 (3.20GHz Upto 4.60GHz, 6 Cores 12 Threads, 12MB Cache)
RAM: 4GB DDR4 2666MHz (x2 Khe cắm)
Ổ cứng: 256GB M.2 PCIe (x1 slot ...
How Many M.2 Slots Do Motherboards Have? - PC Guide 101
The 3500X only has 20 PCIe lanes of bandwidth, so onboard devices on the motherboard, and your GPU using them up, could be limiting the M.2_1 slot to x2.