are you mining with your cpu aswell? that seems a little high
my xeon, 780, 2 HDD's, 2 SSD's, and a full water cooler (with 7 fans) only pulls 75W on idle, and the pump for my watercooler in 20w of that....
Nope. The entire system idles around 40W. Maybe these MSI cards are already 65W TDP... I have them overclocked by 100MHz on the GPU, and 400MHz on the memory.