Honestly I would avoid tier 3 or worse like the plague. The PSU is the heart of your system and can fry anything it is connected to if it goes bad. PSUs are the last place you want to try and save money because of this. I mean yes you could use a tier 3...I just wouldn't do it myself or recommend any friend or family member to use one. I do get budget dictates all but is it worth risking losing your entire rig? Only you can make that call.