the motherboard/PSU combo is the new ATX12VO. There is ZERO Third party option to upgrade power supply. therefore the most you can add in gpu will most likely be a 75w pcie16x powered graphics card. gaming on this is very limited until the power supply becomes available. as of now i have not heard back from acer via email if they have a bigger power supply they will sell. none available on website or anywhere on the internet. i will update rating then for anyone who would like to know. now if you strictly want this for surfing web and youtube small load things like that. its a great computer. starts from off in like 20 seconds. fast processing aslong as its not a heavy load like gaming. i would give a higher then 2 rating if they made it perfectly clear how un upgradable it is.