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Thanks for the write up Does GPUz show CUDA support for both your dGPU and eGPU?

dGPU K4100m with an eGPU 750ti on PE4L2.1. I'm also having problems with win10. Everything is detected correctly, but I can only enable the eGPU by disabling the dGPU. I want to use my eGPU for rendering so I need both cards enabled. Problem is that with both cards enabled, I lose CUDA support on both cards. With either card disabled, CUDA support returns, all according to GPUZ

I see...I'm beginning to believe this is an issue with Win10 and Nvidia Optimus....

Did you have to do anything special to get CUDA support? Here's a thread a recently started talking about some of the problems I ran into trying to get CUDA working: https://www.techinferno.com/index.php?/forums/topic/9612-k4100-750ti-no-cuda/

I'm on a Dell M6800, Win10 x64 with a Quadro K4100 dGPU and a PE4L V2.1 ( PCIe Adapter ) with a Geforce 750ti. Everything is detected correctly in device manager with Geforce desktop driver version 364.51 I'm trying to use both video cards for rendering in Blender which only requires CUDA cores but I've run into a strange problem. With the eGPU plugged in, I lose CUDA support on both cards in GPUz. When I disconnect the eGPU, I get back CUDA support in GPUz. Any thoughts? Thanks eGPU plugged in: eGPU disconnected

@Yuikaze I have a k4100 dGPU and a GTX750ti eGPU. Few questions: 1. Under GPUz, do you see CUDA support for both video cards? 2. Did you install the desktop driver for the quadro or geforce? FYI: I'm on a Dell M6800 with a K4100 dGPU and a PE4L V2.1 ( PCIe Adapter ) Thanks!