The temps seem to be good with the yellow blower in front and the fan in back pulling hot air away.
I always thought the fans on the cards were set up to take air from inside the case and direct it out the "back" of the card, where the video connectors are...
do you have it with the air from the Stanley blower going into the "back" of the cards and out the "front"?
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that 780 is one seriously long card!