One-Knee-Toe

See Attached: The HP Spec on the MoBo topology also correlate with my tests with Two Quadro P2000s. The Intel CPU Specs also show that the CPU has the dedicated lanes to support two x16 PCIe devices.

Forgive the very stupid question - what does that mean, doesn't support? * Both cards are plugged into the two x16 Gen3 PCIe slots. * I have an external PSU (700W) dedicated to powering these two GPUs. Is there something more about the MB that is needed?

Scenario: I just received two EVGA RTX 2080 XCs and the EVGA NVLink bridge. I installed both of them on the two PCIe3 X16 slots I have available (confirmed using GPU-Z). I installed the NVLink bridge. I updated Windows 10 to 1809 (Enterprise, 64bit, LTSC 2019, Build 17763.107). I installed the latest NVIDIA Driver (417.35) - did "Clean Install". Issue: When I go to NVIDIA Control Panel, the SLI option is not present, only the PhysX sub-menu exists. Extra Info: Physically, I know both PCIe Slots are a part of the same PCIe root complex. I am able to run two Quadro P2000s in TCC and perform direct (dev-to-dev) cudaMemcpys. I confirmed Dev2Dev using NSIGHT; I had a 3rd GPU for display. Dev2Dev would not be possible if the PCIe devices were on different roots. Question/Request: Any ideas from the community as to why the NVIDIA Driver is not exposing the SLI option? System: Single Intel Xeon E5-1650 V4. 32GB DDR4. 480GB SSD HyperX Savage. HP Z640 Workstation with the HP 710325-002 Motherboard. HPs Spec Sheet: http://www8.hp.com/h20195/v2/GetPDF.aspx/c04400040.pdf External 700W PwrSupply dedicated to the two GPUs. Stock PwrSupply to drive MB and other peripherals. Two EVGA NVIDIA GeForce RTX 2080 XC with EVGA NVLink. Thank you, in advance.