Whether marked Quadra 630, LC 630, or Performa 63x, this model has 4 MB of RAM soldered to the motherboard and a single 72-pin SIMM socket for memory expansion up to 36 MB. (The DOS Compatible version and some 630s have a different motherboard with two SIMM slots and are covered on a separate page.)
The Quadra model is a bit more powerful with its full 68040 CPU, while the LC and Performa models use the 68LC040 version of the CPU, which has not FPU (Floating Point Unit).
With the edge connector facing away from you, you will see a SIMM socket near the left edge of the motherboard, running from the front of the computer to the rear. It is typically filled with a 4 MB SIMM from the factory. This can be filled with a 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, or 32 MB SIMM. The SIMM must be 80ns or faster.
Some 64 MB SIMMs are compatible with the 630. See the pickle’s Low-End Mac FAQ for clarification on which 64 MB SIMMs are compatible and which are not. With a compatible SIMM, you can have 68 MB in your 630.
To add memory, simply put the new SIMM in the SIMM socket.
It is possible to add a second SIMM slot to the logic board if you’re handy with a soldering iron. This makes memory upgrades to 52 MB possible.
Keywords: #quadra630 #maclc630 #performa630
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