SGI Challenge XL Memory

Maximum Memory	16GB
Memory Expansion boards	4 (1 to 4 can be installed)
non-removable base memory per MC3 board	0MB
Expansion slots in each MC3 board	32 (8 banks of 4) (2GB maximum)
2-way interleaving can be accomplished by filling corresponding banks (banks A & B, C & D etc.) on one board.
4-way interleaving can be accomplished by filling corresponding banks across two boards.
8-way interleaving can be accomplished by filling corresponding banks across four boards.
SGI's documentation recommends taking advantage of interleaving capabilities instead of filling all the banks on one memory board when the system contains multiple memory boards.
Different banks may contain kits of different density; however it is RECOMMENDED to fill corresponding banks with kits of SAME density.