GPU fan not kicking on right away

serengo1

Distinguished
Jan 12, 2010
10
0
18,510
AMD 6870 Card made by Sapphire. Card works fine other than it takes about 15 min for the fan to spin up. I have updated the driver and I have SpeedFan for temp monitoring/fan control. The computer is fairly clean because I cleaned it when I installed a new CPU Heatsink a few weeks ago. Any ideas would be appreciated.