i wish to upgrade the processor on my acer aspire timeline 4810t with a mobile intel core 2 solo su3500 (Intel 82801IEM ICH9M-E, cantiga gs45). is it possible and in case how/where to find a compatible processor?
Please contact the laptop manufacturer for them to provide you a list of supported processors for your alptop. Keep in mind that the compatiblity is determined by the laptop manufacturer, not by the processor manufacturer.
SU3500 is a BGA processor soldered on a motherboard. You can upgrade it only by unsoldering the old CPU and soldering new one, or replacing the motherboard with better processor. So, in my opinion, your laptop is not upgradeable.