I am looking for some help. 

Any time I add a third video card to the system the host system xwindows  will 
crash at random times and drop me to the command prompt. 

I do not start in Xwin. Sometimes I can restart with startx sometimes I have to 
reboot. Hard power restart.



The primary card for the host system is a Nvidia K620 4k output

The first passthru card for Win7 VM is an Nvidia k4200 4k output

The third card  is one of three that I have tried  Nvidia K2000 or M4000 or AMD 
W5100 (any one of these cause a crash in the host Xwindows)



Mother board is a supermicro X10SRA-F

I had the same problem with an ASUS X99 Deluxe



CPU XEON 1630 V3

Also tried with an I7-5960



64GB 2133 ecc memory



OS Fedora 25 4.10.13-200.fc25.x86_64



I am using the Nvidia driver for Xwin on the host machine.



I have 4 VM's in the background two Ubuntu linux and two win7 



The K4200 is attached to one of the win7 machines.



 
My grub file:



GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rhgb quiet intel_iommu=on pci-stub.ids=10de:11b4,10de:0e0a,1
0de:13ba,10de:0fbc rd.driver.blacklist=nouveau"
GRUB_DISABLE_RECOVERY="true"
[jim@localhost ~]$ more /etc/sysconfig/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rhgb quiet intel_iommu=on 
pci-stub.ids=10de:11b4,10de:0e0a,10de:13ba,10de:0fbc 
rd.driver.blacklist=nouveau"
GRUB_DISABLE_RECOVERY="true"



Jim



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