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Memory Upgrade for Apple Macintosh Performa 640CD DOS Compatible
Apple Macintosh Performa 640CD DOS Compatible memory upgrade specification, Macintosh Performa 640CD DOS Compatible maximum memory, memory speed, and memory upgrade options.
Upgrade memory on Apple Macintosh Performa 640CD DOS Compatible upto a maximum of 52 MB on system board / 32 MB on DOS card
This system supports the Apple DOS card. The maximum memory for the DOS card is 32MB, and has one socket. You may install standard 72pin non-parity SIMMs, 4mb, 8mb, 16mb and 32mb modules., with maximum per slot in 2 system board / 1 socket DOS card memory slots. The Apple Macintosh Performa 640CD DOS Compatible takes the This system supports the Apple DOS card. The maximum memory for the DOS card is 32MB, and has one socket. You may install standard 72pin non-parity SIMMs, 4mb, 8mb, 16mb and 32mb modules. Memory Type.
| Apple Macintosh Performa 640CD DOS Compatible Memory Upgrade Specification | ||||
|---|---|---|---|---|
| Standard Memory | Maximum Memory | Memory Expansion | CPU Type | Model/Chipset |
| 4 MB (removable) 4MB non-removable + 4 MB (removable) on DOS card | 52 MB on system board / 32 MB on DOS card This system supports the Apple DOS card. The maximum memory for the DOS card is 32MB, and has one socket. You may install standard 72pin non-parity SIMMs, 4mb, 8mb, 16mb and 32mb modules. |
2 sockets system board / 1 socket DOS card | 66/33MHz Motorola 68LC040 | 40MHz FSB |
Apple Macintosh Performa 640CD DOS Compatible Memory Upgrade options.
What are memory sockets or slots and how are these divided into bank?
Memory Sockets or Slots are the place where memory RAM modules are inserted in the motherboard. The Apple Macintosh Performa 640CD DOS Compatible has 2 system board / 1 socket DOS card memory expansion slots. A memory bank is a group of memory expansion sockets, a bank must be completely filled with memory modules of the same size and type in order for the system to recognize and address the memory. i.e. :
2 sockets (2 banks of 1) This indicates that there are 2 memory slots. These are divided into 2 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
3 sockets (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 3 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
4 sockets (2 banks of 2) This indicates that there are 4 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
8 sockets (4 banks of 2) This indicates that there are 8 memory slots. These are divided into 4 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
12 sockets (3 banks of 4) This indicates that there are 12 memory slots. These are divided into 3 banks, and each bank consists of four memory slots. So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.
