An 8-bit computer wanting 64K of RAM, could most straightforwardly use eight 64kx1 DRAM chips (64kbit, 1 data line). The Commodore 64 initially did this, but in the mid-80s, the cost-reduced redesign used two 64kx4 chips (256kbit, 4 data lines) instead.
It seems that something similar could have been done a generation earlier. For example, the Acorn Electron stuck to 32K to save cost. This was provided with four 64kx1 chips, requiring two clock cycles to fetch each byte from memory, which greatly reduced performance. If it could have used 16kx4 chips, it would seem possible to have achieved twice the performance without significantly increasing cost, yet this was not done, perhaps because such chips were not available?
Did any 8-bit computers use 16kx4 chips?