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Vintage Macs: Centris and Quadra

Quadra 630 RAM Expansion

Chris Placzek

This page provides information about modifying the motherboard in your Quadra/Performa/LC 630 series computer. Such modifications are not authorized by Apple. Any modifications you perform on your Mac may damage it and will void any warranty. Modifications are done at your own risk.

The Quadra 630 (a.k.a. LC 630; Performa 630, 635, 636, 637, and 638) motherboard is the same as the Performa 631 and Performa 640 motherboard - except in the number of RAM slots. The Quadra 630 board has 1 RAM slot, while the 631 and 640 have 2.

The Quadra 630 board does have solder pads for an extra RAM slot. If you can get your hands on a 72-pin RAM socket and solder it to the solder pads in the Quadra 630, you will have 2 functional RAM slots. This will bring the maximum RAM up to 52 MB from 36 MB. (Just like the 631 and 640, the second RAM slot can not accept a SIMM larger than 16 MB.)

If you're wondering where to get a 72-pin RAM socket, try an old cheap PC motherboard.

Go to the 630 profile.

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