Actually, before I missed that you mentioned the CPU. If the CPU says 2.4 just to the right of the screen, then it is a 2.4+. In 2009 they changed the CPUs and now they don't have the 2.4 printed there, so a SL+ would not have that. For 2009 all the CPUs use the 2.4 gHz frequency now so I guess they didn't think it was necessary to write it on the CPU.