NO

my 8800gt idles at 45oC and 75 on load.

but i replaced the stock fan with a dual zalman fan and temps are now 32oC idle and 62 max on load with cs and crysis.
 
So it's nothing wrong with like 45-50 idle and 55-65(70) on full load temperature? Or that's can hurt video card?

No, temps are fine. Generally a video card can handle up to 120*c, give or take, without incurring any physical damage. It's still priority to keep it 80*c or less, as artifacting and general funkiness will be present well below critical temps.
 
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