I want to use (4)ATI 7970 graphics cards in Quad CrossfireX on an MSI X79 Big Bang X-Power II mobo. Technically, the mobo has enough PCIe x16 slots to accomodate the 4 cards. However, the botton card overhanges the mobo's OC buttons, the Reset button, the PCIe on/off switches, and several headers. It also leaves me short (2)PCIe x1 slots for my Auzentech sound card and my TV card.
My question is, is it possible to use a PCIe x16 flexible riser, such as an Ameri-Rack Technology #ARC1-PELY423-C7 (w/7cm ribbon) and take the TV external?
Not sure if that riser would work...but that appears to be the only way to fit your extra devices in your motherboard. Although I would be scared of blowing up your 7970's if the riser card doesn't work properly.
Also be wary of this:
Use for motherboard with chipset that supports bifurcation.
The easiest solution is to use a USB TV tuner and USB or on-board sound. If you insist on using PCIe for either one, your best solution is to drop a video card. The riser card is likely to play havoc in a system with as much bus activity as a quad-Crossfire system will have not to mention the challenge of mounting it so that you can plug the required cables into the cards.