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Desktop 5130DB-IL User's Manual
Note:
Be sure to use memory modules of the same type, same speed, same frequency on the
same motherboard. Mixing of memory modules of different types and speeds is not allowed.
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. See the following table for details.
Possible System Memory Allocation & Availability
System Device
Size
Physical Memory Remaining/Available
(4 GB Total System Memory)
Firmware hub flash memory (System BIOS)
1 MB
3.99
Local APIC
4 KB
3.99
Area reserved for the chipset
2 MB
3.99
I/O APIC (4 KB)
4 KB
3.99
PCI Enumeration Area 1
256 MB
3.76
PCI Express (256 MB)
256 MB
3.51
PCI Enumeration Area 2 (if needed) Aligned on
256MB boundary
512 MB
3.01
VGA memory
16 MB
2.85
TSEG
1 MB
2.84
Memory available to OS and other applications
2.84
Memory Population Guidelines
When installing DIMMs, the memory slots should be populated in the following order: DIMMA2
and DIMMB2, then DIMMA1, DIMMB1.
Always use DDR4 modules of the same size, type and speed.
Mixed DIMM speeds can be installed, however, all DIMMs will run at the speed of the slowest
DIMM.
Recommended Population (Balanced)
DIMMB2
DIMMA2
DIMMB1
DIMMA1
Total System
Memory
4GB
4GB
8GB
4GB
4GB
4GB
4GB
16GB
8GB
8GB
16GB
8GB
8GB
8GB
8GB
32GB
16GB
16GB
32GB
16GB
16GB
16GB
16GB
64GB