Scythian

Dear Members, I'm beginner in this eGPU topic, but I'd like to setup my computer properly. I've bought DIYeGPU Setup 1.3. I have a HP 8460p notebook with 6GB RAM with Expresscard and an EXP GDC Beast v8.0 Expresscard version. Now I don't know exactly which video card would be the best and most compatible option. I checked GTX 760 and 780 that probably don't need DSDT override and I was thinking about GTX 970 also but it needs DSDT override. I have a few questions about DSDT override if'd like to use DIYeGPU Setup: -should I connect the eGPU adapter first, or I can do this without connecting it? -what are the necessary steps in your Setup 1.3 application to execute DSDT override? -will I get a successful message if it was ok, or I have to test this later somehow? If I'll know that DSDT override works then I could buy the video card. Thank you in advance for your answers!