Apple Power Macintosh 8600 - Manual (Page 129)

7 If you’re upgrading the cache module, insert the new one as illustrated below.
IMPORTANT Do not touch the connectors on the cache module. Handle it only
by the edges.
Cache module slot Cache module (Your module’s shape and components may vary.)
The cache module is designed to fit into the slot
only one way. Be sure to align the notches in the
module with the small ribs inside the slot.
Connectors
Notches
(Toward front of computer )
Ribs (inside slot)
129 Installing PCI Expansion Cards and Additional Memory