Power for multiple Xeon Phi cards

Hi,

System:  Ubuntu 14.01 LTS, MPSS 3.4.1

We have a server with 2KW power supply, which the manufacture claims support up to 6 Xeon Phi Cards.

When I run my program on Xeon Phi (31S1P) uses all the cores (100% core utilization). I see the power usage on each card is about 188  Watts, which is much lower than 275W in the Xeon Phi specification sheet. I wonder if I can plug all 6 Xeon Phi 31S1P card to the server. What should I check to make sure the system is not under power?  In case the system is under power, is there any damage to CPU and GPU?

   Thanks