It sound like your graphics card is trying to process far too much detail.
You can try the following
1). lower your graphics details
2). lower your screen resolution
3). overclock your graphics card
4). overclock your processor.
All these options will help to reduce lag but they will never eliminate it.
ps. The i7-2700K is only a 4 core processor, the hyperthreading make it appear that it has 8 core. Also, the dump from dxdiag was completely unnecessary, noone will read it and it takes too much space.