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HELP Chassis fan spikes

tobascovodka
Level 7
I have an issue,
i have CH-fan 2+3 linked to temp sensors 1+3 monitoring my 2x970s
randomly at idle my CH-fan2 (tied to my GPU1 temp sensor 3) will ramp up to max speed 2900rpm even though my temps are stable, and gpu fans dont even turn on until onboard temp is over 60
it does not happen in game when GPU1 temps are 55-80

in the fan expert graph it shows my custom fan curve and the orange dot that indicates current temp/duty cycle jumps to the top of the graph and then falls straight up and down while GPU monitor shows no temp change at all. my fan curve is set to only ramp up to max at temps above 90, it is set to no more then 35% at temps up to 70

I have tried various fan curves custom, preset, and 5way optimization
I have tried changing out the fan with a spare both a noctua and antec
I have tried changing out the temp sensor with 2 different ones asus and nzxt

I am at a loss, I have found another post about a similar issue but the solution that worked for them did not for me
I have 7 other fans that are not having this problem at all. 5x 140mm and 2x other 120mm

Overview hardware

Rampage V
5960x
hyperx ddr4 3k 16gig
samsung xp941
SLI 970s
noctua indurtrial PWM 120mm fans
win8.1
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2 REPLIES 2

tobascovodka
Level 7
yes all my fans are pwm