DAQ NI6363 X series PCI-e Power

[penditaaa]

Hi,

What happen if we not connect the PCI-e with the power? I used the new PC without that type of power provide by the PC power supply.

What is the use of that power connection, because i can detect the device.

[ZachHindes]

Ho penditaaa,

From the X Series User Manual (http://digital.ni.com/manuals.nsf/websearch/DB99DF5BA93B63B18625777C00684538😞

PCI Express Device Disk Drive Power Connector

(PCI Express X Series Devices) The disk drive power connector is a four-pin
hard drive connector on PCI Express devices that, when connected,
increases the current the device can supply on the +5 V terminal.

When to Use the Disk Drive Power Connector

PCI Express X Series devices without the disk drive power connector
installed perform identically to other X Series devices for most applications
and with most accessories. For most applications, it is not necessary to
install the disk drive power connector.
However, you should install the disk drive power connector in either of the
following situations:
• You need more power than listed in the device specifications
• You are using an SCC accessory without an external power supply,
such as the SC-2345
Refer to the specifications document for your device for more information
about PCI Express power requirements and current limits.

And from the 6363 specifications (http://digital.ni.com/manuals.nsf/websearch/39541B5E05FB3A358625773B006F71D8😞

Power Requirements

NI PCIe-6361/6363
Without disk drive power connector installed
+3.3 V .................................... 4.6 W
+12 V ..................................... 5.4 W
With disk drive power connector installed
+3.3 V .................................... 1.6 W
+12 V ..................................... 5.4 W
+5.0 V .................................... 15 W