***
*** I know that PS/2 is an ancient interface. I only chose PS/2 because it is my understanding that a PS/2 keyboard and mouse combination is better supported and earlier, during the actual Linux boot process, than a USB keyboard and mouse combination. So PS/2 keyboard and mouse offer more liklihood of functionality when there are Linux boot problems.
*** I also understand that USB keyboards and mice, take far more and more complex software drivers to be loaded before keyboard and mouse functionality appears. So a non-bootong Linux may not offer a functional USB keyboard / mouse service, whereas a PS/2 cpmbination might already be alive and functional.
*** If I'm wrong on this PS/2 versus USB keyboard / mouse boot-friendliness business, I will happily switch to using USB keyboard / mouse.
I would echo Giles advice on not getting any PS/2 accessories. There were some motherboards that had some keyboard legacy setting in their firmware. I might be completely ignorant on this matter, but I believe the setting was for OSes that didn't have USB drivers.
*** Is it just a superstition that I read somewhere, that there is there a memory access speed advantage, to using more DIMMs to get the desired total memory size ?? For example, that a dual-DIMM 2x8GB configuration provides faster memory access than a single DIMM 1x16GB ??
Some motherboards would interleave their memory accesses. I don't know if that's true today.