Do you know which matter MOST effect to life time of GPU cards? OC or Temperature or Votage or ...?
voltage can SCREW your gpu instantly if you go very high, so be aware, don't play with that, oc can't do any harm if only on the core, but for the mem be more careful, because you can damage them if you see artifact, temperature also remain under 70° to not stress too much the gpu, so first voltage then temp then OC