I have two Geforce 750 Ti GPU cards, but can only install one at a time in my X58 motherboard.


When I try installing both, I get a Kernel PANIC immediately, no X, no
 
Is there a recommended troubleshooting procedure?  I'm not sure if my motherboard's BIOS needs an update, or it's something else.
 
Enough people run dual GPUs that I would expect this would work, if I load the right driver bits.
  system.hardware.primary_video.vendor = 4318 (0x10de)
  system.hardware.primary_video.product = 4992 (0x1380)
  system.hardware.serial = 'OEM'
  system.hardware.uuid = '00000000-0000-0000-0807-060504030201'
  system.board.serial = ''
  system.firmware.vendor = 'Phoenix Technologies, LTD'
  system.firmware.version = '6.00 PG'
  system.firmware.release_date = '10/06/2009'
  system.hardware.vendor = 'OEM'
  system.hardware.product = 'OEM'
  system.hardware.version = 'OEM'
  system.chassis.manufacturer = 'OEM'
  system.board.product = '141-BL-E757'
  system.board.version = 'Tylersburg'
  system.board.vendor = ' EVGA'
......
42: PCI 200.0: 0300 VGA compatible controller (VGA)
  [Created at pci.318]
  UDI: /org/freedesktop/Hal/devices/pci_10de_1380
  Unique ID: B35A.UhMN+4kVS20
  Parent ID: 3hqH.h8i6gWf1Jl1
  SysFS ID: /devices/pci0000:00/0000:00:03.0/0000:02:00.0
  SysFS BusID: 0000:02:00.0
  Hardware Class: graphics card
  Model: "nVidia VGA compatible controller"
  Vendor: pci 0x10de "nVidia Corporation"
  Device: pci 0x1380
  SubVendor: pci 0x3842 "eVga.com. Corp."
  SubDevice: pci 0x3753
  Revision: 0xa2
  Driver: "nvidia"
  Driver Modules: "nvidia"
  Memory Range: 0xf1000000-0xf1ffffff (rw,non-prefetchable)
  Memory Range: 0xc0000000-0xcfffffff (ro,non-prefetchable)
  Memory Range: 0xde000000-0xdfffffff (ro,non-prefetchable)
  I/O Ports: 0xbf00-0xbf7f (rw)
  Memory Range: 0xf2f00000-0xf2f7ffff (ro,non-prefetchable,disabled)
  IRQ: 44 (1626566 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v000010DEd00001380sv00003842sd00003753bc03sc00i00"
  Driver Info #0:
    Driver Status: nvidiafb is not active
    Driver Activation Cmd: "modprobe nvidiafb"
  Driver Info #1:
    Driver Status: nouveau is active
    Driver Activation Cmd: "modprobe nouveau"
  Driver Info #2:
    Driver Status: nvidia is active
    Driver Activation Cmd: "modprobe nvidia"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #19 (PCI bridge)
 
 
 
 
kernel version is 3.2 - Ubuntu release is 12.04 - and I'll use these dual GPUs for computing and driving 6 monitors.

----- /proc/cmdline -----
  BOOT_IMAGE=/boot/vmlinuz-3.2.0-58-generic root=UUID=2f47b7b4-b6c7-4b61-9b60-69b887bb03e7 ro recovery nomodeset
....