Well, I had problems with my PSU as well, when I bought my new vid-card. Judging from the specs on the sticker on the PSU, it could feed my vid-card just fine. But it didn't. PSU's can decrease in quality over the years. I had random black-outs on my system. I bought a new high quality PSU from XFX and I had no more black-outs. My new PSU is 750W max and is a lot more silent then my old 580W.
If your systems remains stable, I shouldn't worry too much. PSU's are meant to get hot. But if you experience black-outs for no reason at all, you should replace the PSU with a better one.
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