What else do i need in a computer?

It's not what you need; it's what you have extra and donn't need it. You have 3 RAM modules. Core i5-750 is dual channel memory as well as any LGA 1156 CPU. If you insert 3 RAM modules your dual channel will not be activated, resulting in reduced memory performance. If money is not an issue i recomend Dual 4Gig RAM. I have 2x2Gig on a windows 7 x 64 and my usage never goes more that 2.5 GB with al my graphics application running.