Supermicro SUPERSERVER 5025M-UR User Manual page 42

S S
UPER ERVER 5025M-UR User's Manual
Memory Support
The PDSMU supports up to 8 GB of unbuffered ECC/non-ECC DDR2-667/533/400
SDRAM. Interleaved memory requires modules of the same size and speed to be
installed in pairs. Do not mix DIMMs of different sizes and speeds. Notes: Due to
OS limitations, some operating systems may not show more than 4 GB of memory.
Due to memory allocation to system devices, memory remaining available for op-
erational use will be reduced when 4 GB of RAM is used. The reduction in memory
availability is disproportional. (Refer to the table below for details.)
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 to System
BIOS & OS applications
To Install: Insert module vertically
and press down until it snaps into
place. Pay attention to the bottom
notch.
To Remove: Use your thumbs
to gently push each release tab
outward to free the DIMM from the
slot.
Possible System Memory Allocation & Availability
Size
1 MB
4 KB
2 MB
4 KB
256 MB
256 MB
512 MB
16 MB
1 MB
Figure 5-3. Installing DIMM into Slot
5-8
Physical Memory Remaining
(4 GB Total System Memory)
3.99
3.99
3.99
3.99
3.76
3.51
3.01
2.85
2.84
2.84
DDR2 FBD DIMM
Top View of DDR2 FBD Slot