I agree with epixoip, if they are all in a case, for sure reference design but even then, I have found that the middle cards still get "cooked" because they are in the middle and cannot get any airflow due to the other cards being right next to them and the heat radiates out of the cards. The reference coolers do get most of the heat out of the front of the cards but not all of it.
See how u go but have a serious think about cooling and maybe doing a custom mod on your case IF they over-heat too easy.
See how u go but have a serious think about cooling and maybe doing a custom mod on your case IF they over-heat too easy.