Tesla k40c on Win10 shows "This device cannot start (Code 10)"


I bought a K40c and plugged into my workstation HP Z840, and installed the driver, but the K40c did not work. In the device manager, the device state of K40c is “This device cannot start (Code 10)”. I don’t know how to do now.

There is another GPU in the workstation, Quadro P6000. It works well. Only the Tesla K40c did not work. And I use one 8pin Connector to 2 * 6pin for power.

So do you have any suggestions? I’m looking forward to your professional advices. Thank you in advance.

Some details:
Windows10 Pro 64bit
CPU: Intel® Xeon® E5-2630 v4 *2
Memory: 64GB
GPU: Quadro P6000, Tesla K40c
Storage: 256G SSD + 2T SATA

Were you able to solve the problem? I have the same with the K20x and Quadro P4000. Still code 10 .