What does PC3 mean? Tags: Memory DDR3 RAM Last response: December 20, 2010 1:11 PM in Memory Share anroin December 20, 2010 4:39:40 AM 4GB (2*2GB) DDR3 1333MHz CL9 PC3 RAM Some rams have this in their names,some do not.What difference do they have? Thanks More about : pc3 saint19 a c 163 } Memory December 20, 2010 1:11:46 PM Hi. PC = DDR PC2 = DDR2 PC3 = DDR3 None = DDR, DDR2 or DDR3. Not difference if your RAM has or not the PC x. Can't find your answer ? Ask ! Publish Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !