Asus X99-A motherboard gpu compatibility

[Jollyjon]

So I'm building a pc, no budget concerns just don't want to spend a ludicrous amount on one part. These are the parts I've decided on.

-Asus x99-a
-Intel Core i7-5820K
-Corsair hydro H100i
-16gb DDR4 3000mhz
-Corsair RM 750 (idk what wattage I need)
-Corsair Graphite case 780t

So my question now is, what graphics card do I get? I'd look it up, But I've heard so many mixed things, like some sketch called "pc specs" or something said that there were only 3 gpu's compatible and the cheapest was $550, it also said that my processor wasnt compatible with my mobo either. While another website said as long as the pins are the same? Again, idk what that means.

If I'm leaving out important information I'm sorry, this is my first build. The total I'm at right now is at $1500 with this gpu:
[ Gigabyte GTX 960 Overclocked 4 GB GDDR5 Graphics Card GV-N960WF2OC-4GD ] is that compatible?

Thank you

 

[Tradesman1]

Your rig will run about any GPU, would look for a PCI-E 3 GPU, so basically any that your budget allows for if looking at the 960 that's fine or up to the 970 or 980 or 980 TI -as said it depends on your budget 😉