I would return that thing and get something else instead of buying a system and already looking to change components in it. Especially in a pre-built that will have lower end parts in it like a low quality power supply. You should take that $500 and use it towards building one yourself from parts, I'm sure you have relatives or friends that built computers before and there are tons of build suggestions on the forums. I looked at what WalMart sells and there is really nothing worth the money I see on there. Too many of them use custom parts or put the money towards lights instead of good parts and specs. Spending an extra $100 on RGB lights to get a weak CPU and cheap power supply won't do anyone good. By the time you spend almost $200 on a decent video card for 1080 gaming, another $160 on a CPU that will be good for modern games, maybe upgrade the RAM to 16 GB, put in a solid state drive which every modern system should have, you would have added up to a much better built system with better parts. All the extra changes will add up to $400 to make the system a decent gaming one. Spending that 700-900 in the first place will get a much better system if using parts you bought yourself.