Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Doesn't do 90 watts on an Inspiron 8200

I got this power supply on an emergency basis to replacde my missing Dell Inspiron 8200. Inspiron 8200's require a 90w power supply. I picked this one over others beacuse it explicitly said that it suppoerted the 8200. While my 8200 will charge the battery from it, it will NOT run at 90w power, only 75w and it gives me a boot up warning that the power supply is inadequate. Back to the store...