Bought a 2nd TITAN today and sometimes it's detected when I boot up the PC and sometimes it isn't? What could be causing this problem? I enable SLI when it's detected and it's shown in device manager. Then it disappears when I reboot.
Intel Core i7 3970X Six Core 4.4ghz Overclocked
2x nVidia GeForce GTX Titan 6144MB GDDR5 PCI Express Graphics Card
32GB Corsair Vengeance DDR3 1866MHz C10 Quad Channel Memory Kit
Asus Rampage IV Intel X79 Motherboard
Samsung 840 Pro 256GB SSD
Samsung 840 Pro 512GB SSD
Seagate 2TB Barracuda Green 32MB Cache SATA II Hard Disk Drive
Microsoft Windows 7 Ultimate (64-bit)
Corsair H100i CPU Cooler
Corsair AX860i PSU
Intel Core i7 3970X Six Core 4.4ghz Overclocked
2x nVidia GeForce GTX Titan 6144MB GDDR5 PCI Express Graphics Card
32GB Corsair Vengeance DDR3 1866MHz C10 Quad Channel Memory Kit
Asus Rampage IV Intel X79 Motherboard
Samsung 840 Pro 256GB SSD
Samsung 840 Pro 512GB SSD
Seagate 2TB Barracuda Green 32MB Cache SATA II Hard Disk Drive
Microsoft Windows 7 Ultimate (64-bit)
Corsair H100i CPU Cooler
Corsair AX860i PSU