Hardware configuration: Intel i7-4770K @ 4.5 GHz, 16 GB DDR3-2133 Corsair Vengence (black/red), EVGA GTX 760 @ 1200 MHz, on an Asus Maximus VI Hero MB (black/red), in a blacked out Antec P280 Tower, with a Xigmatek Night Hawk (black) HSF, Seasonic 760w Platinum (black case, sleeves, wires), 4 SilenX 120mm Case fans with silicon fan gaskets and silicon mounts (all black), a 512GB Samsung SSD (black), and a 2TB Black Western Digital HD (silver/black).
The GPU FAQs on the project home page have info for setting up dual GPUs, so start there if you haven't been there yet. Same for the SMP setup. Otherwise...
The setup of the SMP client and the GPU client are separate issues. Create two new posts, once in the SMP section, and once in the GPU section with your GPU type.
If your topic is a duplicate of an existing thread, trust the Mods to merge it or move it to the correct location. Just go for it. The sooner you start folding, the better.