Sure, yes, because the purpose of 72-pin SIMMs was for 32-bit wide memory access. Before 72-pin SIMMs were 30-pin SIMMs. Simple arithmetic shows you that you c

Sure, yes, because the purpose of 72-pin SIMMs was for 32-bit wide memory access. Before 72-pin SIMMs were 30-pin SIMMs. Simple arithmetic shows you that you can't route a 32-bit memory bus over 30 pins. You need banks of SIMMs and that means they need to be matched. But the 386DX was too expensive, because it needed a 32-bit memory bus. So it didn't sell well and was mainly used in PCs used as servers. PC servers didn't really exist yet in 1985. That's why the 386SX was invented, with a 16-bit memory bus. It meant the motherboard only needed a 16-bit memory bus, meaning it was much cheaper. But that means it doesn't really need 72-pin RAM. It wasn't until the 486 (and 68040) went mainstream that ordinary desktop computers needed 32-bit memory buses and therefore 72-pin RAM, but over time, economies of scale drove down the cost of 72-pin RAM so it became cheaper and gradually got adopted, and the 16-bit-bus 386SX (and derivative chips with the 486 instruction set, such as the 486SL and 486SLC) gradually went away.