MSI GTX 650 Power Edition OC Review @ OCC
 

It was very easy to overclock the MSI GTX 650, it felt like it wanted to keep on going and going! Eventually it topped out at 1325MHz core and 1400MHz memory. The core overclock is fantastic and surprising for a card at this tier. MSI Afterburner was able to overvolt the core and memory, which definitely gave it an edge. The card ran stable and seemed content with the changes throughout testing. The card was ran in Dual Fan Mode to get the best temperatures as there is plenty of room in the 650D!

http://www.overclockersclub.com/reviews/msi_gtx650_pe/