2 Replies Latest reply on Jan 29, 2016 1:45 AM by nevets

    HD7850 Fan Only Spins at 90%+ Speed


      Hello there, i have an HD7850 which lately started doing this:
      The fan is on auto and it doesn't spin, the latest "radeon settings" says speed 20%, but it doesn't move.

      The temperature raises, the speed shows 35%, but fan is OFF

      Temp keeps going up over time, radeon settings reports fan speed 50%...60%....70%...80% Yet the fan doesn't move at all.


      Only when the speed shows "90%" the fan start spinning at full speed.


      Setting fan to manual does the same.

      Any value between 0% and 89% = OFF.

      Any value between 90% and 100% = FULL SPEED


      So basically my fan became binary..



      Radeon Software Version - 16.1

      Radeon Software Edition - Crimson

      Graphics Chipset - AMD Radeon HD 7800 Series

      Memory Size - 1024 MB

      Memory Type - GDDR5

      Core Clock - 860 MHz

      Windows Version - Windows 7 (Service Pack 1)

      System Memory - 16 GB

      CPU Type - Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz


      Radeon Settings Version - 2015.1223.1060.19763

      Driver Packaging Version - 15.301.1201-151223a-297971C

      Provider - Advanced Micro Devices, Inc.

      2D Driver Version -

      Direct3D® Version -

      OpenGL® Version -

      OpenCL™ Version -

      AMD Mantle Version -

      AMD Mantle API Version - 98309

      AMD Audio Driver Version -


      Graphics Card Manufacturer - Powered by AMD

      Graphics Chipset - AMD Radeon HD 7800 Series

      Device ID - 6819

      Vendor ID - 1002

      SubSystem ID - 3264

      SubSystem Vendor ID - 1682

      Revision ID - 00

      Bus Type - PCI Express 3.0

      Current Bus Settings - PCI Express 2.0 x16

      BIOS Version -

      BIOS Part Number - 113-785ZNF80.SB  

      BIOS Date - 2012/05/08 03:22

      Memory Size - 1024 MB

      Memory Type - GDDR5

      Memory Clock - 1200 MHz

      Core Clock - 860 MHz

      Total Memory Bandwidth - 153 GByte/s

      2D Driver File Path - /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/Class/{4d36e968-e325-11ce-bfc1-08002be10318}/0000


      Any help appreciated. Thanks.

        • Re: HD7850 Fan Only Spins at 90%+ Speed

          If you use MSI Afterburner and adjust the fan manually, does it change? If it doesn't, it's most likely a faulty fan controller and the card needs to be RMAd.

            • Re: HD7850 Fan Only Spins at 90%+ Speed

              The fan only responds on the 87% to 100% speed range. Below that it doesn't spin.


              Edit: Figured it out. The fan is broken. (even though it's able to spin at full speed)

              I have two HD7850, i switched the fans.


              Card with problem + another fan = All Good.

              Card without problems + my fan = Problem appears.


              So it's time for shopping. For future reference the fan you need to buy for an HD7850 it's a model: FD7015H12s (12v 0.43a) it costs $10-$15 and takes about 10 minutes to replace.