53C idle is quite good...I have my 6800GT at Ultra speeds and never see below ~58C unless it's ridiculously cold in the room or something. As far as load temps...I personally would consider anything under 80-85C to be fine, although mine I believe never goes higher than about 75 so I doubt you'd get that high. (these cards run really hot...)
I believe they default to shutdown at 120C, for what it's worth.
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