5x 1080 TI on linux

[fl0at0xff]

hello, below the output. Seems to have some bug with CUDA. I only connected 3 GPU for now. 

Code:

Successfully initialized NVIDIA CUDA library.

Failed to initialize NVIDIA RTC library.

* Device #1: CUDA SDK Toolkit not installed or incorrectly installed.
            CUDA SDK Toolkit required for proper device support and utilization.
            Falling back to OpenCL runtime.

Successfully initialized NVIDIA CUDA library.

Failed to initialize NVIDIA RTC library.

* Device #2: CUDA SDK Toolkit not installed or incorrectly installed.
            CUDA SDK Toolkit required for proper device support and utilization.
            Falling back to OpenCL runtime.

Successfully initialized NVIDIA CUDA library.

Failed to initialize NVIDIA RTC library.

* Device #3: CUDA SDK Toolkit not installed or incorrectly installed.
            CUDA SDK Toolkit required for proper device support and utilization.
            Falling back to OpenCL runtime.

* Device #4: Outdated POCL OpenCL driver detected!

OpenCL Info:
============

OpenCL Platform ID #1
  Vendor..: NVIDIA Corporation
  Name....: NVIDIA CUDA
  Version.: OpenCL 3.0 CUDA 11.7.99

  Backend Device ID #1
    Type...........: GPU
    Vendor.ID......: 32
    Vendor.........: NVIDIA Corporation
    Name...........: NVIDIA GeForce GTX 1080 Ti
    Version........: OpenCL 3.0 CUDA
    Processor(s)...: 28
    Clock..........: 1582
    Memory.Total...: 11176 MB (limited to 2794 MB allocatable in one block)
    Memory.Free....: 11008 MB
    OpenCL.Version.: OpenCL C 1.2
    Driver.Version.: 515.57
    PCI.Addr.BDF...: 01:00.0

  Backend Device ID #2
    Type...........: GPU
    Vendor.ID......: 32
    Vendor.........: NVIDIA Corporation
    Name...........: NVIDIA GeForce GTX 1080 Ti
    Version........: OpenCL 3.0 CUDA
    Processor(s)...: 28
    Clock..........: 1582
    Memory.Total...: 11178 MB (limited to 2794 MB allocatable in one block)
    Memory.Free....: 11008 MB
    OpenCL.Version.: OpenCL C 1.2
    Driver.Version.: 515.57
    PCI.Addr.BDF...: 03:00.0

  Backend Device ID #3
    Type...........: GPU
    Vendor.ID......: 32
    Vendor.........: NVIDIA Corporation
    Name...........: NVIDIA GeForce GTX 1080 Ti
    Version........: OpenCL 3.0 CUDA
    Processor(s)...: 28
    Clock..........: 1582
    Memory.Total...: 11178 MB (limited to 2794 MB allocatable in one block)
    Memory.Free....: 11008 MB
    OpenCL.Version.: OpenCL C 1.2
    Driver.Version.: 515.57
    PCI.Addr.BDF...: 04:00.0

OpenCL Platform ID #2
  Vendor..: The pocl project
  Name....: Portable Computing Language
  Version.: OpenCL 1.2 pocl 1.4, None+Asserts, LLVM 9.0.1, RELOC, SLEEF, DISTRO, POCL_DEBUG

  Backend Device ID #4
    Type...........: CPU
    Vendor.ID......: 128
    Vendor.........: GenuineIntel
    Name...........: pthread-Intel(R) Core(TM) i3-7100 CPU @ 3.90GHz
    Version........: OpenCL 1.2 pocl HSTR: pthread-x86_64-pc-linux-gnu-skylake
    Processor(s)...: 4
    Clock..........: 3900
    Memory.Total...: 5873 MB (limited to 1024 MB allocatable in one block)
    Memory.Free....: 2904 MB
    OpenCL.Version.: OpenCL C 1.2 pocl
    Driver.Version.: 1.4

I think I need to install CUDA SDK too ?