Re: PSU to fit HD4870?
Your current PSU is actually fine. According to Google you should have a 2 way molex to 6pin that came with your PSU in the box. That plus the one that is built in will provide enough power off what you already have, as the other two that you linked are technically worse.
If you insist on buying a new PSU, the cheapest I could recommend is a Corsair CX500.
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