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S
S
UPER
ERVER 1027R-WC1R/1027R-WC1RT User's Manual
Notes:
Using DDR3 DIMMs with different operating frequencies is not allowed. All channels
in a system will run at the lowest common frequency.
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 re-
duction in memory availability is disproportional. See the following table for details.
Possible System Memory Allocation & Availability
System Device
Firmware Hub fl ash memory (System BIOS)
Local APIC
Area Reserved for the chipset
I/O APIC (4 Kbytes)
PCI Enumeration Area 1
PCI Express (256 MB)
PCI Enumeration Area 2 (if needed) -Aligned on 256-
MB boundary-
TSEG
Memory available to OS and other applications
Size
Physical Memory
Remaining (Available)
(4 GB Total System
1 MB
3.99
4 KB
3.99
2 MB
3.99
4 KB
3.99
256 MB
3.76
256 MB
3.51
512 MB
3.01
1 MB
2.84
2.84
5-10
Memory)
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