These days I'm trying to use VFIO on the Dell server, But not successful.
Even use GT730 as guest, I still got blank screen, even Seabios or OVMF.
However, this time I'm try to passthrough Quadro K420 on my X79 platform, I got unexpectedly success.
In this case, I'm using Ubuntu 14.04 as Host OS, and only install latest QEMU and libvirt, I wont use virt-manager this time.
Then I use my XML profile that I make before, launch VM by using virsh. And K420 works great.
So maybe we got new chocie about low-level Quadro Series card passthrough into VM.