85c still in acceptable range although such temperature is quite high given today standards (in the past mid 80s to mid 90s are the norm for high end cards). you can use third party utility such as MSI After Burner and do your own fan curve instead let the driver automatically adjust your fan speed. sometimes even board partners tune the fan speed favoring low noise instead focusing to keep the temperature as low as possible during heavy gaming session. For example Asus new Strix series. the fan will only starts spinning when gpu core reach 65c. below that the fan will stop completely