I just installed a VF900 on my video card, and when I turned on the computer, I saw that the fan wasn't running. So the 3 pin connection to the video card wasn't working. I tried switching the position of the 3 pin, but that didn't work either. So what I did was connect, the 3 pin connector of the VF900 to a 3pin-4pin adaptor, and connected it to a 4-pin molex...and it worked. So I'm wondering if this is okay, instead of the VF900 being connected to the video card.
...Temps went from idle 47C to 33C...awesome!
3770K | ASUS STRIX GTX 1080 | DDR3-1600 16GB | CORSAIR 650D | CORSAIR HX 850W | CORSAIR H100 | SOUND BLASTER Z | ASROCK EXTREME4 GEN3