kunthakenthe :
Let me tell you if you want to max out skyrim you need 3 r9 290x's/ 3 gtx 780ti's.
What are you talking about? Vanilla Skyrim is NOT a demanding game, my GTX 770 2GB can max it out easily with 100+ FPS without V-sync.
OP, if you want to mod the hell out of Skyrim then you don't want the 780ti since it only comes with 3GB of VRAM, you want the 6GB 780. If you plan on running texture mods, then the extra VRAM will seriously help to ensure a stutter free experience. I max out my VRAM pretty much as soon as I load into my game, I really wish I went for the 4GB 770. Modded Skyrim likes as much VRAM as it can have, I assume it'll only get worse when Fallout 4 is FINALLY announced/released.
Edit: For reference, my 770 can run Skyrim with multiple full size texture packs, a demanding ENB, and tons of other mods at around 40-50 FPS, so a 780 will easily run the game heavily modded at around 50-60+ FPS.