Well, the OSDev Wiki’s discussion of RAM detection on x86[1] still mentions the issue of bus capacitance in its discussion of memory probing (while exhorting you not to attempt memory probing). The text is likely old, but probably not C64 old. Pentium-era old maybe?

[1] https://wiki.osdev.org/Detecting_Memory_(x86)#Practical_obst... and https://wiki.osdev.org/Detecting_Memory_(x86)#Manual_Probing...