For a graphics card, check your computer by opening the side up and see if there is a PCI-e x16 slot. If there is you should be able to get away with any graphics card that doesn't have a power connector on the side of it. They are all <$100 USD

Ok and to make things clear, raid 0 deletes ALL your current data. He is right about the hard drive being the slowest part of your system but you will only see some improvements while loading and starting the game. "Loading" caches what you need onto the RAM so once you are done loading the hard drive is irrelevant

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