Unfortunately, you can't upgrade your laptop's processor from Arrandale to Sandy Bridge, because the processor socket is not the same (G2 vs G1). Only one connector stands in the different position, but it's enough. The difference between two sockets is intensional because new Sandy Bridge processor architecture is only compatible with HM 67 chipsets (not with HM 55/ 57 of laptops with Arrandale processors). You can see the picture at
http://www.3dnews.ru/news/613588Arrandale Core i7 processors can freely operate with 8 Gb of DDR3 1333MHz RAM, Arrandale Core i3 / Core i5 processors - only with 4 Gb DDR3 1066 MHz RAM. If you put 1333 MHz RAM blocks into laptop, they will work only at 1066 MHz (you can check it yourself in Aida64/Everest).