When using two or more graphics cards on a motherboard with a PLX PEX chip, you may encounter a random DPC watchdog violation error. To resolve this issue, download the utility MSI utility V2.0 (MSI_util_v2.zip) from the URL below:
This utility will allow you to switch your graphics cards to MSI (Message-Signaled Interrupts) mode. Extract the MSI_util_v2.zip file. Inside you will find an executable file labeled MSI_util_v2.exe. Right-click over the file and select "Run as administrator" as shown in the image below:
This will launch the MSI mode utility. The tool should look similar to the screenshot below. If the window is not showing any devices, this means you did not launch the program with administrative privilages. Search for each of the NVIDIA graphics cards in your PC and then check the "msi" check box for each of the GPUs. Do not check the "msi" box for any other device. If a device already has the "msi" box checked, leave it as is. Once completed, click on the Apply button to confirm the changes.
Please note: You will need to repeat this process each time you reinstall or update your NVIDIA display drivers. For more information on Message-Signaled Interrupts, please visit: