A3000
Thanks for the correction, I couldn't remember off the top of my head.
I just checked an A3000 manual — you can have 4 megs of fast, max,
with 256kx4 DRAMs or 16 megs of fast, max, with 1mx4 DRAMs. Some
early A3000s shipped with 256x4s that you had to replace in order to
upgrade to 16megs, but I think recent A3000s used the 1m parts.