2.6 Power Consumption
In order to ensure safe operation of the board, the ATX power supply must monitor the supply voltage and
shut down if the supplies are out of range – refer to the hardware manual for actual power specification.
The KTQ45/Flex board is powered through the ATX connector and the additional 12V separate supply for
CPU as specified in the ATX specification; besides this the power supplied to the board must be within the
ATX specification.
The requirements to the supply voltages are as follows:
VCC3.3 3.168V 3.432V
Should be ±4% for compliance with the ATX specification
VCC 4.75V 5.25V
Should be ±5% for compliance with the ATX specification.
Should be minimum 5.00V measured at USB connectors
in order to meet the requirements of USB standard.
+12V 11.4V 12.6V
Should be ±5% for compliance with the ATX specification
-12V –13.2V –10.8V
Should be ±10% for compliance with the ATX specification
-5V -5,50V -4.5V Not required for the KTQ45 boards
5VSB 4.75V 5.25V
Should be ±5% for compliance with the ATX specification
Static Power Consumption
The power consumption of the KTQ45/ATXu Board is measured under:
1- DOS, idle, mean
2- WindowsXP, Running 3DMARK 2001 & 2 x CPU BURN, mean
3- S1, mean
4- S3, mean
5- S4, mean
Test system configuration
Test system configuration
The following items were used in the test setup:
1. KTQ45/Flex board mounted w/ 3.00GHz (E8400) Core Duo & 1GB Samsung 1Rx8 PC3-10600U-09-00-
A0 1,5V DDR3 Ram
2. 12V active cooler
3. PS/2 keyboard & mouse (Mouse: Genius Netscroll+ Keyboard:ACK-595)
4. CRT (Nokia 477Pro)
5. HD (Seagate Barracuda 7200.10 160 GB)
6. ATX PSU (OCZ-420ADJ)
7. Tektronix TDS 224, P6345 probes
8. Fluke Current Probe 80i-100S AC/DC
Test setup
Note: The Power consumption of CRT, HD and Fan is not included.
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