I have a white MacBook a1181 with a 2.4 ghZ Intel Core 2 Duo processor and 2gb of RAM. It's been running slowly so I just bought a 4gb RAM chip off amazon. My question is....Would the computer run if I took out all the memory in it now and used only this one chip? If the computer has 2 slots will it run fine when only 1 is occupied? If not, then will the computer run fine with a 4gb chip in one slot and a 1gb chip in the other? The reason for using the 4gb chip only is becuase its much faster (1333mhz, vs 667mhz) Thanks in advance!