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How Many Modules Do You Need
On some computer systems, memory modules must be installed two-at-a-time
or four-at-a-time. For example, if you would like to add 16MB to a 486
system, you will need to purchase and install four 4MB modules.
The list below provides general guidelines; however, individual systems
can vary considerably. For example, some Pentium systems take SIMMs (in
pairs), some take DIMMs (individually), and some can take both.
| Desktop
Systems with Intel® Processors |
| If your PC has a... |
Then you will typically need to purchase... |
| 386 |
30-pin SIMMs installed in banks of 4. |
| 486 |
30-pin SIMMs installed in banks of 4. 72-pin SIMMs
installed individually. |
| Pentium® |
72-pin SIMMs installed in pairs. 168-pin DIMMs installed
individually. |
| Pentium® Pro |
72-pin SIMMs installed in pairs. 168-pin DIMMs installed
individually. |
| Pentium® II7 |
72-pin SIMMs installed in pairs. 168-pin DIMMs installed
individually. |
| Pentium® III |
168-pin DIMMs or 184-pin DIMMs installed individually. |
| Pentium ® IV |
184-pin DIMMs installed individually. |
| Celeron™ |
168-pin DIMMs installed individually. |
| Laptop
Systems with Intel® Processors |
| If your PC has a... |
Then you will typically need to purchase... |
| Pentium® |
72-pin SODIMMs installed in pairs. 144-pin SODIMMs
installed individually. |
| Pentium® II |
144-pin SODIMMs installed individually. |
| Pentium® III |
144-pin SODIMMs installed individually. |
| Celeron™ |
144-pin SODIMMs installed individually. |
| Desktop
Systems with AMD® Processors |
| If your PC has a... |
Then you will typically need to purchase... |
| K5 |
72-pin SIMMs installed in banks of 2. 168-pin DIMMs
installed individually. |
| K6® |
72-pin SIMMs installed in banks of 2. 168-pin DIMMs
installed individually. |
| K6®-II |
168-pin DIMMs installed individually. |
| Duron™ |
168-pin DIMMs installed individually. |
| Athlon™ |
168-pin DIMMs installed individually. |
| Laptop
Systems with AMD® Processors |
| If your PC has a... |
Then you will typically need to purchase... |
| K6®-II |
144-pin SODIMMs installed individually. |
| K6®-II+ |
144-pin SODIMMs installed individually. |
| Duron™ |
144-pin SODIMMs installed individually. |
| Athlon™ |
144-pin SODIMMs installed individually. |
| Apple®
Desktop Systems |
| If your Mac is a... |
Then you will typically need to purchase... |
| Power Mac™ |
168-pin DIMMs installed individually. |
| iMac™ |
144-pin SODIMMs installed individually. |
| Apple
Laptop Systems |
| If your Mac is a... |
Then you will typically need to purchase... |
| PowerBook™ |
144-pin SODIMMs installed individually. |
| iBook® |
144-pin SODIMMs installed individually. |
| Transmeta
Laptop Systems |
| If your system has a... |
Then you will typically need to purchase... |
| Crusoe™ |
144-pin SODIMMs installed individually. |
Note: You should match the new memory with what is already in
your system. You can determine if your system requires parity by counting
the number of small, black, IC chips on one of your modules. If you have
2, 4, 8, 16, or 32 chips then you have non-parity modules. If your module
has 3, 6, 9, 12, 18, or 36 chips then you have parity modules.
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