Hi there,
 
I have a 980 ti hybrid kit coming in soon for my 980 Ti. I found out that you have to leave the fan for the VRM and memory cooling in, I got the hybrid kit specifically to get rid of the horrid noise those fans make when gaming or under moderate load (50 Celsius) I am wondering if I can leave the VRM cooling fan at around 25-30%, this is the speed where it makes no annoying noise.
 
I also have some Noctua 4-pin fans that I can't fit on the header that comes with the kit, does the header that comes with the kit do anything special? I was thinking of just leaving the fan plugged in on my motherboard and having the motherboard ramp the fan speed up whenever it deems necessary.
 
EDIT: I have two kits coming in soon, I am running an SLI setup for if that makes any difference.

dieandpuke
I have 22% up to 35 degrees, 35% up to 45 degrees,  45% on anything higher than 45 degrees.  Over 45% fan and you can start hearing it and that defeats the AIO coolers purpose.  I have not had a single crash in the last 30 days due to temps. 
 
I run at +25 voltage, +200 memory, +108 core. That gets me 1500 core exactly.  Have not tried to go faster than that yet.  I am not one to worry about the last 20 mhz as I know that only gets me .4 of 1 frame per second. 
 
Also what I did to lessen noise is too run the AIO fan on my fan controller.  It stays much quieter this way.  If you do not have a fan controller you can try it off the mobo.

Thanks a lot!
 
Just a question, the 35 degrees, 45 degrees and the other temperatures you mentioned are GPU temperatures right? I'm going to run the AIO fans on my motherboard and have them set at around 800-1000 RPM at all times as I don't trust my motherboard to do fan speed and temperature right as it relies on case temperature which is often completely wrong.
 
I have two reference cards and for some reason I can hear their noise at around 30% already, 25% is the point at where I don't hear them anymore.