You have to connect the first card only, the second card ports don't work.
The second fan will stop when the card is idle
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Desktop: PSU CM Silent Pro M700 - AMD Phenom II X4 955 BE @ 3.92 GHz - Gigabyte GA-990XA-UD3 - Corsair XMS3 8 GB DDR3 @ 1333 MHz - Philips 27" 1080p - Western Digital 500 GB - Sapphire Radeon HD 7970 @ 1000/1425 - SteelSeries USB Soundcard - X360 Controller - Case CM Storm Enforcer - Catalyst 12.11 - W7 x64 SP1