The G73J is getting a bit old to be something viable for the amount of power you need to run photoshop. Now it will increase the speed of the whole process, but you won't really see massive gains. You have to remember that photoshop is not only reliant on the RAM, but the CPU which is now 3 generations old as well as the GPU which is 2 soon to be 3 generations old. My advice would be to stick with what you have or save up a bit until you can get a new computer, since you cannot interchange the CPU/GPU in the current machine. If you really need the small performance gain from adding more RAM, go for it but I would advise against it in this case.