EXPANSION CHASSIS
6-8
PCIe2-2712 PCI Express Gen2 Expansion System User’s Manual
Revision 1.0, February 2015
Table 6-9. 2180W/3240W Power Supply Minimum Loading
6.7
POWER CONSIDERATIONS
Table 3-4 through 3-6 show the power consumption for the Cyclone Microsystems boards and the
power supplied to PCI Express slots. Note that the PCIe-426 is installed in and powered by the host
supply. Consequently, the PCIe-426 should not be included as a component of the Expansion Chassis
power budget.
Table 6-10. PCIe2-462 Power Requirements
Table 6-11. PCIe2- 426/425 Power Requirements
* The PCIe-426 does not use +12V
Table 6-12. Power Supplied Per PCIe Slot
6.8
PCI-E AUXILARY POWER CONNECTORS
Some PCIe add-in cards, especially video cards, require more power than the PCIe spec of 75W per slot
can provide. These cards will have a six or eight position Molex type power connector probably located
at the top or rear edge of the card. The power supply in the expansion chassis has at least eight PCIe
auxilary power cables labeled “PCI-E” available for these card types. GPU card users should verify that
all external power connections to their cards have been made.
Voltage
Minimum Load
Status
+5VSB
0.1A
On board circuitry meets power supply minimum.
+5V
1A
Chassis circuitry meets power supply minimum.
+3.3V
1A
On board circuitry meets power supply minimum.
+12V
6A
Cards must be installed to meet minimum load.
Voltage
Current
Typical
Current
Maximum
Note
+5V SB
0.1A
0.1A
Not used. On board circuitry sets current draw.
+5V
0A
0A
Not used.
+3.3V
1.5A
1.5A + 30A
Maximum is PCIe2-462 circuitry plus 10 slots
x3A per slot = 30A.
+12V
1A
2A + 55A
Maximum is PCIe2-462 circuitry plus 10 slots
x5.5A per slot = 55A.
Voltage
Current Typical
Current Maximum
+3.3V
1.09 Amps
1.60 Amps
+12V
0 Amps
0 Amps
Voltage
Current Maximum
Voltage Tolerance
+3.3V
3.0 Amps
+/- 9%
+12V
5.5 Amps
+/- 8%
