the 7-8-9-10 are the available CLs for use, the SPD info shows for 1333 as CL 10 or 9 (when mixing different models you often have to raise the CL - here if it will work at 10, we can then try at 9) , 8 at 1200 and 7 at 1066. The additional DRAM voltage of + 06 of the 1.5 rating is for same (mixing models. If they play together in the set I gave, we can then try tightening the timings and/or lowering voltage. It's a fairly standard approach used when mixing different sticks