diff --git a/LibreHardwareMonitorLib/Hardware/Gpu/AmdGpu.cs b/LibreHardwareMonitorLib/Hardware/Gpu/AmdGpu.cs
index 1a11a23..f81e5ae 100644
--- a/LibreHardwareMonitorLib/Hardware/Gpu/AmdGpu.cs
+++ b/LibreHardwareMonitorLib/Hardware/Gpu/AmdGpu.cs
@@ -121,27 +121,14 @@ namespace LibreHardwareMonitor.Hardware.Gpu
         {
             if (control.ControlMode == ControlMode.Software)
             {
-                if (_currentOverdriveApiLevel >= 6)
+                AtiAdlxx.ADLFanSpeedValue fanSpeedValue = new AtiAdlxx.ADLFanSpeedValue
                 {
-                    AtiAdlxx.ADLOD6FanSpeedValue fanSpeedValue = new AtiAdlxx.ADLOD6FanSpeedValue
-                    {
-                        SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_PERCENT,
-                        FanSpeed = (int)control.SoftwareValue
-                    };
+                    SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_PERCENT,
+                    Flags = AtiAdlxx.ADL_DL_FANCTRL_FLAG_USER_DEFINED_SPEED,
+                    FanSpeed = (int)control.SoftwareValue
+                };
 
-                    AtiAdlxx.ADL_Overdrive6_FanSpeed_Set(_adapterIndex, ref fanSpeedValue);
-                }
-                else
-                {
-                    AtiAdlxx.ADLFanSpeedValue fanSpeedValue = new AtiAdlxx.ADLFanSpeedValue
-                    {
-                        SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_PERCENT,
-                        Flags = AtiAdlxx.ADL_DL_FANCTRL_FLAG_USER_DEFINED_SPEED,
-                        FanSpeed = (int)control.SoftwareValue
-                    };
-
-                    AtiAdlxx.ADL_Overdrive5_FanSpeed_Set(_adapterIndex, 0, ref fanSpeedValue);
-                }
+                AtiAdlxx.ADL_Overdrive5_FanSpeed_Set(_adapterIndex, 0, ref fanSpeedValue);
             }
         }
 
@@ -167,14 +154,7 @@ namespace LibreHardwareMonitor.Hardware.Gpu
         /// </summary>
         private void SetDefaultFanSpeed()
         {
-            if (_currentOverdriveApiLevel >= 6)
-            {
-                AtiAdlxx.ADL_Overdrive6_FanSpeed_Reset(_adapterIndex);
-            }
-            else
-            {
-                AtiAdlxx.ADL_Overdrive5_FanSpeedToDefault_Set(_adapterIndex, 0);
-            }
+            AtiAdlxx.ADL_Overdrive5_FanSpeedToDefault_Set(_adapterIndex, 0);
         }
 
         public override void Update()
@@ -214,34 +194,22 @@ namespace LibreHardwareMonitor.Hardware.Gpu
                 }
 
                 AtiAdlxx.ADLFanSpeedValue fanSpeedValue = new AtiAdlxx.ADLFanSpeedValue { SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_RPM };
-                AtiAdlxx.ADLOD6FanSpeedValue fanSpeed6Value = new AtiAdlxx.ADLOD6FanSpeedValue { SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_RPM };
-                if (_currentOverdriveApiLevel <= 5 && AtiAdlxx.ADL_Overdrive5_FanSpeed_Get(_adapterIndex, 0, ref fanSpeedValue) == AtiAdlxx.ADLStatus.ADL_OK)
+                if (AtiAdlxx.ADL_Overdrive5_FanSpeed_Get(_adapterIndex, 0, ref fanSpeedValue) == AtiAdlxx.ADLStatus.ADL_OK)
                 {
                     _fan.Value = fanSpeedValue.FanSpeed;
                     ActivateSensor(_fan);
                 }
-                else if (_currentOverdriveApiLevel >= 6 && AtiAdlxx.ADL_Overdrive6_FanSpeed_Get(_adapterIndex, ref fanSpeed6Value) == AtiAdlxx.ADLStatus.ADL_OK)
-                {
-                    _fan.Value = fanSpeed6Value.FanSpeed;
-                    ActivateSensor(_fan);
-                }
                 else
                 {
                     _fan.Value = null;
                 }
 
                 fanSpeedValue = new AtiAdlxx.ADLFanSpeedValue { SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_PERCENT };
-                fanSpeed6Value = new AtiAdlxx.ADLOD6FanSpeedValue { SpeedType = AtiAdlxx.ADL_DL_FANCTRL_SPEED_TYPE_PERCENT };
-                if (_currentOverdriveApiLevel <= 5 && AtiAdlxx.ADL_Overdrive5_FanSpeed_Get(_adapterIndex, 0, ref fanSpeedValue) == AtiAdlxx.ADLStatus.ADL_OK)
+                if (AtiAdlxx.ADL_Overdrive5_FanSpeed_Get(_adapterIndex, 0, ref fanSpeedValue) == AtiAdlxx.ADLStatus.ADL_OK)
                 {
                     _controlSensor.Value = fanSpeedValue.FanSpeed;
                     ActivateSensor(_controlSensor);
                 }
-                else if (_currentOverdriveApiLevel >= 6 && AtiAdlxx.ADL_Overdrive6_FanSpeed_Get(_adapterIndex, ref fanSpeed6Value) == AtiAdlxx.ADLStatus.ADL_OK)
-                {
-                    _controlSensor.Value = fanSpeed6Value.FanSpeed;
-                    ActivateSensor(_controlSensor);
-                }
                 else
                 {
                     _controlSensor.Value = null;
diff --git a/LibreHardwareMonitorLib/Interop/AtiAdlxx.cs b/LibreHardwareMonitorLib/Interop/AtiAdlxx.cs
index 90437a9..ebef520 100644
--- a/LibreHardwareMonitorLib/Interop/AtiAdlxx.cs
+++ b/LibreHardwareMonitorLib/Interop/AtiAdlxx.cs
@@ -96,15 +96,6 @@ namespace LibreHardwareMonitor.Interop
         [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
         public static extern ADLStatus ADL_Overdrive5_FanSpeed_Set(int adapterIndex, int thermalControllerIndex, ref ADLFanSpeedValue fanSpeedValue);
 
-        [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern ADLStatus ADL_Overdrive6_FanSpeed_Get(int adapterIndex, ref ADLOD6FanSpeedValue FanSpeedValue);
-
-        [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern ADLStatus ADL_Overdrive6_FanSpeed_Set(int adapterIndex, ref ADLOD6FanSpeedValue FanSpeedValue);
-
-        [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern ADLStatus ADL_Overdrive6_FanSpeed_Reset(int adapterIndex);
-
         [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
         public static extern ADLStatus ADL2_OverdriveN_PerformanceStatus_Get(IntPtr context, int adapterIndex, out ADLODNPerformanceStatus performanceStatus);
 
@@ -364,20 +355,7 @@ namespace LibreHardwareMonitor.Interop
             public int FanSpeed;
             public int Flags;
         }
-
-        [StructLayout(LayoutKind.Sequential)]
-        internal struct ADLOD6FanSpeedValue
-        {
-            /// Indicates the units of the fan speed.  Possible values: \ref ADL_OD6_FANSPEED_TYPE_PERCENT, \ref ADL_OD6_FANSPEED_TYPE_RPM
-            public int SpeedType;
-            /// Fan speed value (units as indicated above)
-            public int FanSpeed;
-            /// Value for future extension
-            public int ExtValue;
-            /// Mask for future extension
-            public int ExtMask;
-        }
-
+        
         [StructLayout(LayoutKind.Sequential)]
         internal struct ADLFanSpeedInfo
         {