What is the most important thing to look for in a 1080? Or any GPU for that matter. I see from the selections they vary in price but they also vary in MHz and Boost MHz. What the most important thing when it comes to the Oculus as I am going to buy one and drop kick my 390 as it sucks. I'm not really clued up on GPU's, I am a mechanical guy. Electronics etc pass me by unless its control systems and g-code. I tended to just buy whatever had the most Gb but I appreciate this might be the wrong move. Ta.