B-20
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Appendix B
Hardware Configuration
Overheat/PWR Fail/Fan Fail LED
An Overheat/PWR/Fail/ Fan Fail LED is located at LED2.
Data Cables
The data cables in the system have been carefully routed to maintain airflow efficiency. If you
disconnect any data cables, take care to re-route them as they were originally when reconnecting
them.
Caution
Ensure the cables do not come into contact with the fans.
Upgrading Memory
The mainboard supports 4 240-pin UDIMM ECC DDR4 SDRAM slots with maximum memory
size of 64 GB.We recommend you purchase your DDR-4 UDIMM modules from National
Instruments. Other off-the-shelf DDR-4 UDIMM modules are not guaranteed to work properly.
DIMM Module Population Sequence
When installing memory modules, the DIMM slots should be populated in the following order:
DIMMB2, DIMMA2, DIMMB1, DIMMA1.
•
Always use DDR4 DIMM modules of the same type, size and speed.
•
Mixed DIMM speeds can be installed. However, all DIMMs will run at the speed of the
slowest DIMM.
•
The motherboard will support odd-numbered modules (1 or 3 modules installed).
However, for best memory performance, install DIMM modules in pairs to activate
memory interleaving.
Table B-43.
Overheat/PWR Fail/Fan Fail LED Indicator)
LED Color
Definition
Solid
Overheat
Blinking
PWR Fail or Fan Fail
