if the hp has a good cpu in it you did not list the cpu then i would remove the two gig ram dimm and replace it with 4g stick. 8g is the right size ram for a gaming pc. the other draw back is the power supply and gpu of the pc. you need a better then the stock unit to put in a 950 or 960 an an entry level gaming card. depending on how you game and the games you play you may need a higher end gpu.