Reply 23140 of 53258, by lazibayer
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The AS4C4M4F1 chips are 4M x 4bit FPM chips, and the K4P160411C chips are 4M x 4bit FPM chips as well. The extra pins are for extra CAS lines; the former has 1 CAS line and the latter has 4 lines.
I read some articles about ECC and couldn't find why it requires 2 extra bits per 8 bits of data. For example, this one says 7 extra bits for 32 bits of data and 8 extra bits for 64 bits of data.