The issue is the stupid Hauppauge cards don't work right when the PCIE speed ramps up from cards in adjacent slots. (Anything over 1x they freak out or if the pcie mode jumps to 2.0/3.0)
You need to keep the card in it's own non shared slot and set the PCIE mode for that slot to 1.0 only. (Your manual will indicate which slots are shared, same in the BIOS PCIE slot speed section.)
Hauppauge poorly designed their cards and this is what the result of that is.
MB: ASUS Rampage IV Black Edition
CPU: Intel Xeon E5-2697 v2 (Cooled by Corsair H100i w/ Noctua NF-F12 fans)
RAM: 64GB G.SKILL RipjawsZ 1600 (10-10-10-30)
GPU: EVGA GeForce GTX Titan X Hybrid
TV Tuners: 2 * Hauppauge HVR-1800
Case: CoolerMaster Cosmos 2