By no means complete, and more useful for older cards than for newer, is:

http://www.chipmunk.nl/DRAM/ChipManufacturers.htm

The last-but-one (2000) of the Apple RAM-guide series is:

http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/Utilities/memguide.pdf

Happy deciphering.

de