Supero SuperServer 5028R-WR, User Manual

Page: 56 / 130

5-10
S
UPER
S
ERVER 5028R-WR User's Manual
Notes:
Using DDR4 DIMMs with different operating frequencies is not allowed. Be sure to
use memory modules of the same type, same speed, same frequency on the same
motherboard. 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 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 Kbytes) 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 256-
MB boundary-
512 MB 3.01
TSEG 1 MB 2.84
Memory available to OS and other applications 2.84