Sonnet Technologies Crescendo_NuBus Processor Upgrade Card - Manual (Page 85)

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If your computer contains a Level 2 cache card, it is recommended
that you remove it. Your new Sonnet Crescendo NuBus processor
upgrade card includes its own backside cache architecture so
removing your old cache will have no negative effect on your
computing experience.
Level 2 Cache Card Removal – Power Macintosh 6100,
6100 AV, Performa 611X, and Workgroup Server 6150
If there is a Level 2 cache card installed in your computer, it will be
located in the L2 Cache Slot, located next in between the ROM card and
the CPU with the large heatsink (Figure 1). Do not mistakenly remove
the ROM card. If you remove the ROM card, you will need to replace it
otherwise your computer will not boot.
Removing a Level 2 Cache Card
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Figure 1: Level 2 cache card slot
CPU (with heatsink)
ROM card
L2 cache card