Windows is easy set-up but really a resource hog when it comes to memory.

Now to your question.

The best answer is to write down you're set-up, every piece of hardware, cables, risers, memory, and power supply.

Make sure you have enough watts from the PS ex: your rig draws 650 W at wall make sure you have an 850 or better 1000 because you want it to run cool.

I've been testing a lot of rigs with different setups and found when you try to squeeze the best MH/ from each card you can actually get worse results in the speed of compute.
Back down your overclocking and pump up the power by +5 can really make the GPU compute faster as long as you keep then cool.

I found that a clean version of windows with all the junk turned & apps off and memory set to performance +16000 virtual memory and check icon for thum-nails to work great.

Make sure windows defender is off or better make an exception for the mining software folder and when you open windows defender turn off the app feature as well.
Sometimes you might need to delete the mining software and DL a fresh copy just keep your settings in a note pad file for later use.

Remember to study the mother board features because most motherboards share resources with the USB channels for pci slots so turn the unused USB off, set slot generation and turn secure boot off if you mod the video cards bios then use pickelpatcher to sign the modded bios (video) not mother board.

I use the onboard video with no issues but that's not to say I havn't spend hour getting the settings correct,lol