A+ SERVER
DIMM Module Population Configuration
For memory to work properly, follow the tables below for memory installation:
Per Channel DIMM Populations Options
DIMM Type | DIMM A | DIMM B | Max. MHz, | Max. MHz, | Max. GB/ | |
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| 1.5V DIMMs | 1.35V DIMMs | Channel | |
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| SR or DR | Empty |
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Unbuffered |
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SR | SR | 1333 MHz | 1333 MHz | 8 GB | ||
DIMM | ||||||
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| DR | DR |
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| SR or DR | Empty |
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| SR | SR | 1333 MHz | 1333 MHz | 16 GB | |
Registered |
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DR | DR |
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DIMM |
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| QR | Empty | 1333 MHz | 1066 MHz | 16 GB | |
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| QR | QR | 1066 MHz | 800 MHz | 32 GB | |
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Note 1: Due to OS limitations, some operating systems may not show more than 4 GB of memory.
Note 2: Due to memory allocation to system devices, the amount of memory that remains available for operational use will be reduced when 4 GB of RAM is used. The reduction in memory availability is disproportional.
Possible System Memory Allocation & Availability
System Device | Size | Physical Memory Available | |
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| (4 GB Total System |
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| Memory) |
Firmware Hub flash memory (System BIOS) | 1 MB | 3.99 GB | |
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Local APIC | 4 | KB | 3.99 GB |
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Area Reserved for the chipset | 2 | MB | 3.99 GB |
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I/O APIC (4 Kbytes) | 4 | KB | 3.99 GB |
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PCI Enumeration Area 1 | 256 MB | 3.76 GB | |
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PCI Express (256 MB) | 256 MB | 3.51 GB | |
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PCI Enumeration Area 2 (if needed) | 512 MB | 3.01 GB | |
boundary- |
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VGA Memory | 16 MB | 2.85 GB | |
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TSEG | 1 MB | 2.84 GB | |
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Memory available for the OS & other applications |
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| 2.84 GB |
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