Hey, so my dad has got a notebook, that has 1gb memory, and its just not enough. I recently ordered 2GB DDR3 SODIMM 1333mhz ram from kingston, and started to be worried that it wont work. The notebook is Acer Aspire d270 1gb version, so i think it is d270-26crr or 26dbb, and everywhere it says that it is 1066mhz ram. I picked 1333mhz because when i was checking at that time it said somewhere that the ram speed is 1333mhz, so i just bought it. Really appreciate the feedback!