NVLink bridge does not work on two GPUs

Graphics / Linux Linux
1

I wanna connect 2 of my RTX 2070 Super via NVLink bridge, but it doesn’t work.
My config:

  • Motherboard: Gigabyte Z390 GAMING SLI
  • Intel Core i9-9900K CPU
  • Two GPU NVIDIA RTX 2070 SUPER
  • Ubuntu 18.04
  • Nvidia driver: 440.33.01
  • CUDA 10.2, CUDNN 7.6.5

The command nvidia-smi nvlink -s gives out:

GPU 0: GeForce RTX 2070 SUPER (UUID: GPU-913c9fff-8680-7958-692b-8c637e145a26)
         Link 0: <inactive>
GPU 1: GeForce RTX 2070 SUPER (UUID: GPU-045ff14d-996c-5c48-2314-a9184260de02)
         Link 0: <inactive>

The command nvidia-smi topo -m gives out:

        GPU0    GPU1    CPU Affinity
GPU0     X      PHB     0-15
GPU1    PHB      X      0-15

Legend:

  X    = Self
  SYS  = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
  NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
  PHB  = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
  PXB  = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
  PIX  = Connection traversing at most a single PCIe bridge
  NV#  = Connection traversing a bonded set of # NVLinks

The test nvidia simpleP2P gives out:

Checking for multiple GPUs...
CUDA-capable device count: 2

Checking GPU(s) for support of peer to peer memory access...
> Peer access from GeForce RTX 2070 SUPER (GPU0) -> GeForce RTX 2070 SUPER (GPU1) : No
> Peer access from GeForce RTX 2070 SUPER (GPU1) -> GeForce RTX 2070 SUPER (GPU0) : No
Two or more GPUs with Peer-to-Peer access capability are required for /usr/local/cuda/samples/bin/x86_64/linux/release/simpleP2P.
Peer to Peer access is not available amongst GPUs in the system, waiving test.

I found 2 similar questions on the forum, unanswered:

  1. can't enable nvlink on ubuntu with two RTX2070S, but windows can
  2. No Peer-To-Peer-Access and slow CUDA execution with NVLink Bridge present on Ubuntu 20.04

Please, could anyone help me to solve this issue?