Apple Performa 6400/180 - Manual (Page 59)

Specifications Memory - 5
DRAM
6400/200 with Zip
Drive
32 MB DRAM
Expandable to 136 MB using JEDEC-standard DIMM devices in two
sockets (168-pin, extended data out [EDO] mode, 60 ns or
faster, 1K or 2K refresh rate DIMMs).
6500/225, 6500/250
32 MB DRAM
Expandable to 128 MB using JEDEC-standard DIMM devices in two
sockets (168-pin, 5-volt buffered extended data out [EDO]
mode, 60 ns or faster, 2K refresh rate DIMMs)
6500/275
32 MB or 48 MB DRAM
Expandable to 128 MB using JEDEC-standard DIMM devices in two
sockets (168-pin, 5-volt buffered extended data out [EDO]
mode, 60 ns or faster, 2K refresh rate DIMMs)