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8awg is fine up to ~80 amps, which depending on the amp is in the 700-1000rms range, at that point 4awg is the better choice. And yes you could hook up a 500/1 with 8awg.
There's nothing wrong with using larger wire, except that you're telling a person who already has 8awg bought and run to go in and replace it with 4awg when he would gain NOTHING by doing so.
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