The LC 520 and Performa 520 are twins, larger versions of the all-in-one Macs of the past. They have 4 MB soldered on the motherboard and a single SIMM socket for memory expansion. Like other 500-series Macs, the 520 has a slide-out motherboard.

With the ports on the motherboard facing you, you will see a SIMM socket on the far left. This can be filled with a 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, or 32 MB SIMM. The 72-pin SIMM must be 80ns or faster.

To add memory, simply put the new SIMM in the RAM socket.

• a 1 MB SIMM gives you 5 MB total
• a 2 MB SIMM gives you 6 MB total
• a 4 MB SIMM doubles memory to 8 MB total
• an 8 MB SIMM gives you 12 MB total
• a 16 MB SIMM gives you 20 MB total
• a 32 MB SIMM gives you 36 MB total

Mac LC 520 page from Apple Memory Guide.

VRAM, Where More Memory Means Less Speed

The 520 ships with 512 KB of VRAM on the motherboard. You can expand this to 768 KB by installing a 256 KB VRAM SIMM (80ns or faster) in the socket to the right of the memory socket. Some configurations may have shipped from Apple with 768 KB installed.

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