Cant specify gpu fan faster then 73%

GeForce GTX 660; Driver Version: 410.48; Ubuntu 14.04.

Im trying to specify gpu fan speed manualy from terminal like that:
$ sudo nvidia-settings -a “[gpu:0]/GPUFanControlState=1” -a “[fan:0]/GPUTargetFanSpeed=50”

And it works fine, variables was specified and nvidia-smi I see correct values.
±----------------------------------------------------------------------------+
| NVIDIA-SMI 410.48 Driver Version: 410.48 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 660 Off | 00000000:01:00.0 N/A | N/A |
| 50% 40C P8 N/A / N/A | 217MiB / 1993MiB | N/A Default |
±------------------------------±---------------------±---------------------+

And it goes correctly until fan speed of 74%.
If I specify 73 - its ik.
But is I specify 74 or bigger - it does not show eny errors, but just ignore my command. and save the last specified value.
sudo nvidia-settings -a “[gpu:0]/GPUFanControlState=1” -a "[fan:0]/GPUTargetFanSpeed=$

Attribute ‘GPUFanControlState’ (astapp-System-Product-Name:0[gpu:0]) assigned value
1.

Attribute ‘GPUTargetFanSpeed’ (astapp-System-Product-Name:0[fan:0]) assigned value
73.

±----------------------------------------------------------------------------+
| NVIDIA-SMI 410.48 Driver Version: 410.48 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 660 Off | 00000000:01:00.0 N/A | N/A |
| 73% 54C P8 N/A / N/A | 204MiB / 1993MiB | N/A Default |
±------------------------------±---------------------±---------------------+

sudo nvidia-settings -a “[gpu:0]/GPUFanControlState=1” -a "[fan:0]/GPUTargetFanSpeed=$

Attribute ‘GPUFanControlState’ (astapp-System-Product-Name:0[gpu:0]) assigned value
1.

Attribute ‘GPUTargetFanSpeed’ (astapp-System-Product-Name:0[fan:0]) assigned value
75.

±----------------------------------------------------------------------------+
| NVIDIA-SMI 410.48 Driver Version: 410.48 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 660 Off | 00000000:01:00.0 N/A | N/A |
| 73% 54C P8 N/A / N/A | 204MiB / 1993MiB | N/A Default |
±------------------------------±---------------------±---------------------+

nvidia-settings -q all | grep Fan Attribute ‘GPUFanControlState’ (astapp-System-Prod$
‘GPUFanControlState’ is a boolean attribute; valid values are: 1 (on/true) and 0
‘GPUFanControlState’ can use the following target types: GPU.
Attribute ‘GPUTargetFanSpeed’ (astapp-System-Product-Name:0[fan:0]): 73.
The valid values for ‘GPUTargetFanSpeed’ are in the range 0 - 100 (inclusive).
‘GPUTargetFanSpeed’ can use the following target types: Fan.
Attribute ‘GPUCurrentFanSpeed’ (astapp-System-Product-Name:0[fan:0]): 73.
The valid values for ‘GPUCurrentFanSpeed’ are in the range 0 - 100 (inclusive).
‘GPUCurrentFanSpeed’ is a read-only attribute.
‘GPUCurrentFanSpeed’ can use the following target types: Fan.

The 410 driver is outdated, please check with a current driver.