Note that modern RAM has length matched traces. Take a look at all the PCB traces near RAM and CPU. You can see them 'squiggle' looking for matching-space at e

Note that modern RAM has length matched traces. Take a look at all the PCB traces near RAM and CPU. You can see them 'squiggle' looking for matching-space at either end of the RAM/CPU connection. PCBs make things like consistent length matching easier. All circuit boards have near identical lengths, controlled impedances and other features that support ... Well... Effectively 6-billion baudrates for DDR5. 6000Mhz DDR5 with 64-bits per half-clock (3000Mhz clock so 6000 transfers per second) has a bit every 5 centimeters or so.