I have some 4000MHz DDR4 SDRAM with stated timings of 20-20-20-40 that I want to install into a motherboard with a CPU that only supports 2000MHz DDR4 SDRAM (due to the memory controller).

Q1: If I just install this 4000MHz DDR4 SDRAM into the motherboard, will the BIOS be smart enough to automatically configure the memory controller (speed and timings) so: (A): the memory will work, and (B): the timings will be at the appropriate lower values to get maximum possible speed from the SDRAM (or close)?

Q2: What do the four timing values refer to?

Q3: If I configure the BIOS for these 4000MHz DDR4 SDRAM sticks with 20-20-20-40 timings to operate as 2000MHz DDR4 SDRAM sticks with 10-10-10-20 timings... are those values appropriate? More generally, how does one configure the BIOS to install faster DDR4 SDRAM into a motherboard (to get best possible performance)?