Please consider the thought of building your own. Its SUPER easy and there are lots of tutorials out there, I went from knowing nothing to lots in a week tops. Its extremely easy and fun!

I Would Consider, but i don't know all the parts i need. the only part i know in the computer is the motherboard lol

If you aren't willing to learn the basics of making a computer, there isn't much that you can do with $600.
You really should learn build a custom rig. Within a week, you could know everything you would need to know. There are literally tens of thousands of videos that cover topics from all of the components to how to put the parts together to what parts are compatible with one another. You can even find videos that show gaming builds for different budgets.

Trust me, its not as daunting a task as it looks. It's actually quite fun!

Here are some resources to help you out.
A guide to picking components
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Website you can use to see compatibility and compare prices
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Subreddit dedicated to building computers, can be useful for finding good parts and use in case you run into any errors during the build
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What $650 will get you if you buy
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What $650 will get you if you build
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Yeah, the prebuilt uses an APU, that has a R9 280 in it. Please, for your own good build it yourself.