XVME-6700A
USER
’S
MANUAL
Acromag, Inc. Tel: 248-295-0310
- 31 -
http://www.acromag.com
- 31 -
https://www.acromag.com
3.14.2 Thermal Throttling
3.14.2.1 CPU Throttling (Hardware Controlled)
The processor must not exceed the 100°C maximum junction temperature
(Tj).
When the integrated thermal monitor on the processor determines that the
maximum processor temperature has been reached, the CPU clock speed will
be throttled back in 100MHz increments to keep Tj from exceeding the
maximum junction temperature of 100°C.
If throttling is not enough to keep
the processor’s
Tj below the catastrophic
temperature limit of 105°C, the voltage supply to the processor will be turned
off within 500ms to prevent permanent silicon damage.
3.14.2.2 Thermal Management (OSPM Controlled)
In addition to the hardware throttling described above, software controlled
passive trip points may be configured using the system BIOS setup.
For information on how to configure these trip points, refer to
The APTIO
Haswell Core BIOS Manual For Acromag Products.
3.14.3 Memory Throttling
The memory bandwidth can be throttled back automatically if a thermal
sensor is on the DIMM. The NCT6776D will alert the memory controller via
PECI when the system memory exceeds its normal operating temperature.
For further information on configuring the memory bandwidth throttling
based on temperature readings from the DIMM’s thermal sensor
, refer to
The
APTIO Haswell Core BIOS Manual For Acromag Products
.
3.14.4 Thermal Management Hardware
The XVME-6700A is available in air-cooled and extended air-cooled models
only. A larger double-slot heatsink is also available as an accessory. Please
consult the factory for more information.
Air-cooled assemblies must be installed into an air-cooled VME chassis with
proper airflow across the board. At least 300LFM of airflow is required to
ensure proper operation across entire specified temperature range.
In addition to the air-cooled heatsink assemblies, special SODIMM heat
spreaders are used to remove heat from the SODIMM modules, as well as
hold them tightly secured to the board.
To remove the SODIMM modules, simply remove the 4 screws per SODIMM
from the back side of the PCB.
