What is the correct topology of 8 K80 GPUs?

Hello forum,

Our GPU topology is shown as follows. It seems there are two groups in our GPU setup. GPU0-GPU1 are separated from GPU2-GPU7. Is it correct? What is the correct topology of 8 K80 GPUs? Thank you very much.

nvidia-smi topo -m

GPU0    GPU1    GPU2    GPU3    GPU4    GPU5    GPU6    GPU7    CPU Affinity
GPU0     X      PIX     SOC     SOC     SOC     SOC     SOC     SOC     0-7,16-23
GPU1    PIX      X      SOC     SOC     SOC     SOC     SOC     SOC     0-7,16-23
GPU2    SOC     SOC      X      PIX     PHB     PHB     PHB     PHB     8-15,24-31
GPU3    SOC     SOC     PIX      X      PHB     PHB     PHB     PHB     8-15,24-31
GPU4    SOC     SOC     PHB     PHB      X      PIX     PXB     PXB     8-15,24-31
GPU5    SOC     SOC     PHB     PHB     PIX      X      PXB     PXB     8-15,24-31
GPU6    SOC     SOC     PHB     PHB     PXB     PXB      X      PIX     8-15,24-31
GPU7    SOC     SOC     PHB     PHB     PXB     PXB     PIX      X      8-15,24-31

As I mentioned on your other question, there is not a “correct topology”. The topology will vary depending on what kind of system the GPUs are plugged into.