leave the acx cooler on, as you won't be reaching anywhere close to max temps unless you are putting it in a box with no air holes lol. the classified one is primarily just factory clocked higher, and you could easily overclock it to the same level if you chose to. Card marketing is kinda broken this way, as overclockers can generally get the cheaper card and overclock to roughly the same level (max overclock would likely be lower of course vs the more expensive one). but you get the point right? it's mostly a money grab for people who don't like to overclock, whereas after overclocking the cards become much closer in performance