The card the OP linked to is a just a standard clocked 7770.
I typically run my 7770 @ 1200Mhz core and 1300 Mhz memory with no issues. Temps have never been above 65 C.
I have pushed my card to 1280Mhz core and 1400 Mhz memory but would have random display driver crashes. The few benchmarks I was able to get past did not show any signifigant gains at these speeds so I set them to the 100% stable speeds listed above.
This is my card - http://www.newegg.com/Product/Product.aspx?Item=N82E16814102967
My 3dmark vantage score - http://www.3dmark.com/3dmv/4542270