Sonnet Technologies Crescendo_L2 Processor Upgrade - Manual (Page 37)

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Power Macintosh 6400, 6500, and Performa 64XX Installation
Remove Level 2 Cache Card
Remove the Level 2 cache card. It is located next to the two larger
slots that contain the DRAM (memory) DIMMs (Figure 5).
Reset CUDA Switch
Reset the CUDA switch on the logic board (Figure 6). It is located
directly next to the top DRAM DIMM. Resetting this switch help
ensures that a processor upgrade card installed into your computer is
recognized at the next startup.
Figure 5: Remove Level 2 cache card
DRAM DIMMs
Figure 6: Reset CUDA switch
L2 Cache Slot
top DRAM DIMM
Level 2 cache card
L2 Cache Slot
CUDA switch