Is that IDE<>SD adapter SATA or PATA? From my understanding, Amiga's require PATA, which is less common. I'm sure someone more knowledgeable can explain the who's and why's in detail, but generally speaking:
PATA - Amiga, PeeCee's of yore and Efika
SATA - PeeCee
...and yeah, that PCMCIA RAM is 16-bit. That *IS* going to slow down your 32-bit system.