The EVGA cards have crap heat sinks and fans (reference).
This is because why? My 670gtx ftw never, ever gets above 66c maxed and overclocked with only 60% of fan usage. What experience can you give for the poster?
This 670 is the best card on the market hands down. http://www.newegg.com/Product/Product.aspx?Item=N82E16814130787