hello guys ! my sister is giving me a 8GB hyper X dual 1866 for my old PC. i was wondering if the RAM will work. the MOBO shows (2 x DIMM, Max. 8GB, DDR3 1800(O.C.)/1600(O.C.)/1333/1066 Hz) but im having a doubt on my procie. what am i going to do in the future, should i underclock the RAM? or is it fine?