Find someone with a collection of vintage Computer Shopper issues, there's no better research material for such matters. Not only are there articles discussing the merits of different computers and their memory schemes, there are ads touting the month-by-month pricing, speed and capacity of direct-market processors, RAM chips and disk drives.
A few pointers:
-- Early dynamic RAMs were multivendor, with a common parts numbering scheme (and similar DIP pinouts) through the 4k to 256k generations.
-- 4096 x 1 chips for example were 4104, 16,384 x 1 chips were 4116, 65,536 x 1 chips were 4164, 262,144 x 1 were 41256.
-- A suffixed letter often indicated if it was an epoxy (P for plastic) or ceramic (C for ceramic) package.
-- 4-bit-parallel parts were called "nybble-wide" or "nibble-wide" and were numbered 4416 and 4464. The 4464P was the commonest sort used in Apple //e's from 1986 onwards, providing 64kx4 with 120nsec RAS typical.
--The original type-1 IBM AT used paired 4164C's soldered in piggyback stacks to populate its DIP sockets with "128kbit" RAMs, an arrangement possible because IBM custom-packaged these RAMs at their plants to fit a 256-kbit pinout. Finding these today is an Easter Egg hunt through Grampa's workbench, as they were often removed to make way for 41256 chips and squirreled away in some unmarked DIP rail or organizer drawer.
-- 1-megabit parts were the last to operate on 5-volt supply, but were internally 3.3-volt parts
-- 4-megabit parts began a wholesale transition to new technologies like 3.3-volt logic, JEDEC pinouts, SMT surface mounting and Single Inline Memory Modules. By then most new computers used word-wide (16-bit) memory.