Key difference between DDR4 and DDR3 RAM

Can you combine DDR3 and DDR4? ddr3 in ddr4 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 vs ddr4 slot DDR3 13331600 Max # of Memory Channels 2 Max Memory Bandwidth GBs ECC Memory Supported ‡ No GPU Specifications GPU Name‡ Intel® HD Graphics 2500

ddr3 slot Orange Pi 5 Plus（32GB） Rockchip RK3588 8-core 64-bit processor，32GB LPDDR4X, slot supporting SSD and Wi-Fi 6BT module AllWinner H3H5 SoC, 512MB DDR3