Incorrect work of two video cards Quadro M4000 in MacPro 5.1

[bulubash]

When I installing two identical video cards Quadro M4000 on all outputs of one of the video cards, the window smears when it is moved (see photo), this always happens on the video card that is installed in the slot closer to the processors.
I tried all possible combinations of installing cards in different slots, swapping them, but it always happens on the card that is inserted into the slot closer to the processors, there is no such effect on the far card.
I also tried to remove the driver and install it again, the system and the driver sees both cards and individually they work fine.
I need to have 6 monitors on my macpro 5.1, this is essential for my work.
4 monitors from one video card work well, but as soon as you insert a second card, without even connecting monitors to it,
the first card, which is closer to the processors, smears the window when moving.
All information about the system in the photo.
Give advice please, maybe someone faced such a problem, what else can I try, maybe a different version of the driver or something else?