System Memory; Cache Memory; Memory Configuration Rules - Digital Equipment AlphaStation 500 Series User Information

Installing System Options

System Memory

The AlphaStation 500 Series memory sub-system has two banks of memory, which include
(4 x 72) 8 byte Dual In-Line Memory Modules (DIMMs). The are two banks consisting
of four DIMMs. Adding more memory allows your system to run larger, more memory-
intensive software. You can increase your system's RAM to 1 GB.

Cache Memory

Each AlphaStation 500 Series system has either 2 MB or 8 MB on the system board.
Cache size depends on the Model ordered.

Memory Configuration Rules

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Random-access memory can be added only in four DIMM increments (four per bank).
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There are two banks, A & B. Bank A includes J30, J28, J26 and J25. Bank B includes
J23, J29, J27, and J22. Refer to Figure 3-5 and Figure 3-6.
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Always fill at least one bank completely (A or B)
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To fill a bank, start at one end and fill every other DIMM socket. Each bank MUST be
completely filled with like DIMMs.
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Do not mix DIMMs within a bank
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Use same DIMM size within a bank.
•
Use same DIMM vendor within a bank (recommended).
3-8 AlphaStation 500 Series User Information