Thank you for this detailed reply! I am now getting just short of 4GB/s P2P transfer speeds. That is quite a lot lower than I would expect (given that I get 10GB/s on a dual TitanX PC, 20-30GB/s on a dgx1 and 130GB/s on a dgx2). The dual TitanXp workstation has both GPUs in PCIex16 mode while my TitanV’s run in PCIex8 (due to limited PCIe lane on my 2700x). Could that be the reason?