Can't Titan Black use NVENC?

I compiled FFMPEG with --enable-nvenc and want to encode with NVENC encoder, but I got this error message when running ffmpeg.

[nvenc_h264 @ 0x8ed020] 4 CUDA capable devices found
[nvenc_h264 @ 0x8ed020] [ GPU #0 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] [ GPU #1 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] [ GPU #2 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] [ GPU #3 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] No NVENC capable devices found
I have titan black gpu and as the official document said it should be supported.

my nvenc-sdk version is 5.0

and the nvidia-smi info is listed below.

~> nvidia-smi
Wed Jan 6 16:36:55 2016
±-----------------------------------------------------+
| NVIDIA-SMI 352.39 Driver Version: 352.39 |
|-------------------------------±---------------------±---------------------+
| 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 TIT… Off | 0000:02:00.0 Off | N/A |
| 54% 82C P2 215W / 250W | 4422MiB / 6143MiB | 77% Default |
±------------------------------±---------------------±---------------------+
| 1 GeForce GTX TIT… Off | 0000:04:00.0 Off | N/A |
| 55% 82C P2 160W / 250W | 5926MiB / 6143MiB | 84% Default |
±------------------------------±---------------------±---------------------+
| 2 GeForce GTX TIT… Off | 0000:83:00.0 Off | N/A |
| 58% 83C P2 147W / 250W | 5926MiB / 6143MiB | 68% Default |
±------------------------------±---------------------±---------------------+
| 3 GeForce GTX TIT… Off | 0000:84:00.0 Off | N/A |
| 53% 83C P2 191W / 250W | 3155MiB / 6143MiB | 85% Default |
±------------------------------±---------------------±---------------------+