Supermicro Supero C7Z97-M User Manual page 41

duced when 4 GB of RAM is used. The reduction in memory
availability is disproportional. See the following table for details.
For Microsoft Windows users: Microsoft implemented a design
change in the Windows XP with Service Pack 2 (SP2) and Win-
dows Vista. This change is specific to the behavior of Physical
Address Extension (PAE) mode which improves driver compat-
ibility. For more information, please read the following article at
Microsoft's Knowledge Base website at: http://support.microsoft.
com/kb/888137.
Possible System Memory Allocation & Availability
Firmware Hub flash 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 OS and other applications
Memory Population Guidelines
When installing memory modules, the DIMM slots should be populated in the
following order: DIMMA2, DIMMB2, then DIMMA1, DIMMB1.
• Always use DDR3 DIMM 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.
DIMMA2 DIMMB2
2GB
2GB
4GB
4GB
8GB
8GB
System Device
Recommended Population (Balanced)
DIMMA1
2GB
2GB 2GB
4GB
4GB 4GB
8GB
8GB 8GB
Size
1 MB
4 KB
2 MB
4 KB
256 MB
256 MB
512 MB
16 MB
1 MB
DIMMB1
2GB
4GB
8GB
2-11
Chapter 2: Installation
Physical Memory
Remaining (-Available)
(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
Total System Memory
4GB
8GB
8GB
16GB
16GB
32GB