Best GPU for Rendering

TwebTech

Honorable
Aug 24, 2013
18
0
10,520
I need to know what is the best GPU to render very fast in AutoCAD or Inventor?
My opinion was on more Vram , but I don't mean a very low graphic card like gt 640 4gb. I need your opinion in GTX 760 4Gb / GTX 680 4Gb / GTX 770 4Gb / GTX 690 4Gb / Titan 6Gb / GTX 780 3Gb . But I don't think that spending 1000$ for GPU worth when it is a home PC not expensive workstation.