Can we put DDR4 ram in DDR3 Slot or DDR3 1600Mhz

can i put ddr3 in ddr4 slot   Dan can i use a pcie 40 gpu in a 30 slot

No They don't even fit in the same slots There were a very few motherboards that had DDR4 and DDR3 slots, but you could only use one

DDR3 and DDR4, and finally DDR5, the latest generation Each generation has brought improved data throughput speeds and reduced power use However DDR3 13331600 Max # of Memory Channels 2 Max Memory Bandwidth GBs Any use made of Intel classifications are without recourse to Intel and shall

forest dreams slot AMD B550 ATX DDR4 Wi-Fi 6E Motherboard - Black Model: B550TMHWKWIFI SKU: 6504286 MSI - B550 TOMAHAWK MAX WIFI AMD B550 ATX DDR4 Wi-  DDR4 The latest AI Overclocking system sets speeds automatically based on silicon and cooling quality, and can train continuously to optimize