If you're broke, then why the hell would you get a 4870? There's no point in getting one if you're not gonna spend like $600 on the other parts of your PC. Your other components, such as the CPU will bottleneck the 4870 unless you overclock say, a E7200 to at least 3.6Ghz.
Assuming by broke you mean you're only gonna spend $300 on your PC, I say go with a AMD dual core rig. Those will serve you well for a budget system.
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