Yes, that board has a PCIe x16 slot, so it will accept any PCIe x16 gfx card.
Thank you !
And i have one more question: that board will accept my intel core i7 4790k proccesor ??
No. That board is for AMD processors only. The i7-4790K is an Intel processor and requires a totally different (and newer) platform. Here is the CPU support chart for the AsRock N68C-GS FX: http://www.asrock.com/mb/nvidia/n68c-gs%20fx/#CPU
The i7-4790K requires an Intel 1150-socketed board.