If you are talking about the DDR2 memory, these are all the types that I know:
PC2 9600 (1200Mhz)
PC2 9200 (1150Mhz)
PC2 8800 (1100Mhz)
PC2 8500 (1066Mhz)
PC2 8000 (1000Mhz)
PC2 7200 (900Mhz)
PC2 6400 (800Mhz)
PC2 5400 (667Mhz)
PC2 5300 (667Mhz)
PC2 4200 (533Mhz)
PC2 3200 (400Mhz)