Good its the DC2 version... Much better cooling.
Anyway. At 1920*1080 resolution the GTX660ti will give you great benefits by OCing. If its a lower resolution then not so much...http://www.legitreviews.com/article/2006/14/
There ar some OC results, if you spend more time you could get close to that, unfortunately the one they have is the DC2 TOP version, so don't expect such good temperatures as theirs.