Supermicro X7DWN Plus User Manual page 29

Note 2: Due to memory allocation to system devices, memory remaining avail-
able for operational use will be reduced when 4 GB of RAM is used. The reduc-
tion in memory availability is disproportional. (See the Memory Availability Table
below.)
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-
VGA Memory
TSEG
Memory available for the OS & other
applications
To Remove:
Use your thumbs
to gently push
the release tabs
near both ends of
the module. This
should release it
from the slot.
Size
1 MB
4 KB
2 MB
4 KB
256 MB
256 MB
512 MB
16 MB
1 MB
Installing and Removing DIMMs
Notch
Release
Tab
receptive point
To Install: Insert module vertically and press down until it
snaps into place. Pay attention to the alignment notch at
the bottom.
2-7
Chapter 2: Installation
Physical Memory
Remaining (-Available)
(4 GB Total System Memory)
3.99GB
3.99GB
3.99GB
3.99GB
3.76GB
3.51GB
3.01GB
2.85GB
2.84GB
2.84GB
DIMM2 FBD
Note: Notch
should align
with the
on the slot
2 FBD
Notch
Release
Tab