How to change a40 compute mode to graphic mode

Hi, I currently only have one 2080ti graphics card and one A40 on hand, and there is no core display on the workstation. I inserted two graphics cards into the workstation at the same time, and since the A40 graphics card does not have a display mode by default, I used 2080ti as the display output. After I installed the driver for A40, I found that it could only recognize 2080 Ti and could not recognize A40. A40 displayed an error code 12 on device.(May be 2080Ti conflict with A40) What should I do to switch the A40 graphics card to display mode for the current situation