If you dont know this is still the 1st generation but upgraded, the 2nd generation has 4 smaller transformers on the power supply side such as adassa and cactus. The only differences i can see by looking at both generation 1 amps one original and the other upgraded are the transformers are beefier shown in yellow square and the circuits or chips are a from a differ brand, differ colors shown in the red sqaure on the power supply side, the only thing i can see thats differ from the output side is shown in the green square again all different colors than the original some caps have differ brand names and some chips also. I dont know to much about the mosfets they all look similar to me but its hard to tell but they have the same amount. The rail + and rail - looks a tad bigger also.