I have been working on getting usb pass through to work without crashing my entire unraid Tower and have seen some posts about Q35.  My current VM template is set to use i440fx.  In googling Q35, I see that this emulates the ICH9 chipset and provides better support for PCIe pass through. 

 

Being new to VMs...is there any down side to trying Q35?

 

Dan

I see this in the Manual

 

The Machine type presented to your VM can be toggled between QEMU's i440fx or Q35 chipsets:

 

For Windows-based VMs, i440fx is the default setting and should only be changed if you are having difficulty passing through a PCI-based graphics card (this may prompt Windows to reactivate)

 

For Linux-based VMs, Q35 is the default setting and should not be changed if passing through a GPU

 

http://lime-technology.com/wiki/index.php/UnRAID_Manual_6#Creating_Your_Own_Virtual_Machines