i use an alienware m14x r2 that comes with a 750 gb harddisk that runs at 7200 rpm. as my hdd is n longer working i need to get a new hdd . wuld it be better to get a 1 tb 5400 rpm hdd or the same 750 gb 7200 rpm hdd ? my first priority is that my gaming performance shouldnt be affected as compared to my previous drive.............if i get the 5400 rpm drive will it affect my gaming performance ?