Ahh.. sounds like "Method V" from Unearthed Arcana (1e). Where the number of dice per stat (Str, Int, Wis, Dex, Con, Cha, Com) was based on your class that you choose first (ex: Fighters have, in order, 9, 3, 5, 7, 8, 6, 4). You still obviously only kept the best three, and this method was only...