The Quadra 800 and Apple Workgroup Server 80 have 8 MB of memory on the motherboard and a single bank of four SIMM sockets for memory expansion as far as 136 MB. This was one of the first generation of Macs to use 72-pin SIMMs.

With the rear of the computer away from you, you will see 4 SIMM sockets in the front center of the motherboard.

Each SIMM socket can be filled with a 1 MB, 4 MB, 8 MB, 16 MB, or 32 MB SIMM. You can use different capacities in each bank, but because the Quadra 800 uses a new memory controller that supports interleaving, you should install memory in pairs of matched SIMMs to achieve best performance – 5-10% better, according to Apple. The 72-pin SIMMs must be 60ns or faster.

Special Resource: Dale Adams on Interleaved Memory on Centris 650 & Quadra 800

Quadra 800 page from Apple Memory Guide.

VRAM, Where More Memory Means Less Speed

The Quadra 800 ships with 512 KB of VRAM on the motherboard. You can upgrade this to 1 MB by installing two 256 KB VRAM SIMMs in the VRAM sockets beneath the floppy drive.

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