Please refer to the list of model series below:

Upgrade Support:

VGN-CS1, VGN-CS2, VGN-CS3
VGN-AW1, VGN-AW2, VGN-AW3
VGN-NS1, VGN-NS2
VGN-FW2, VGN-FW3, VGN-FW4
VGN-TT1, VGN-TT2, VGN-TT3
VGN-Z2, VGN-Z3, VGN-Z4,
VGN-SR2, VGN-SR3, VGN-SR4,
VGC-LV1, VGC-LV2
VGC-LN1, VGC-LN2
VGC-JS1, VGC-JS2, VGC-JS3
VGN-G3
VGN-P1, VGN-P2 (Vista pre-installed models only)
VGN-NW1

Clean Install Support: 
VPCW11

VGN-P2 (XP pre-installed models only)