I don’t seem to be able to access the second Kepler processor on my GeForce GTX Titan Z. I’m using Vulkan 1.2 with “VK_KHR_device_group” enabled, and I only see one device group with one device, same as vulkaninfoSDK.exe. Computations submitted to that device are invariably performed on the same processor, leaving the other idle. I’m using 457.30 drivers on Windows 10 x64. On DirectX, the processors appear as two identically named devices. Do I need to enable some setting on the computer or in the Vulkan API, or is it simply a driver limitation cutting performance in half?