I have the following card. Evga GTX 560 Superclocked. http://www.evga.com/products/moreInfo.asp?pn=01G-P3-1463-KR&family=GeForce%20500%20Series%20Family&sw= For some reason. This baby seems to not want to overclock. I am only working on the core/shader for now. Someone told me it could be a voltage issue and I need to up it. But how? MSI Afterburner will not allow voltage unlock. I guess since this is a newer gpu release. I get it up to 900 and it gets unstable. Backing it down even more. It still gets unstable. Which is weird. Because before that as I moved up closer to 900. It was fine. Stock runs perfectly okay. So I seem to agree it could be a voltage issue? Or I got one that just will not overclock? But that seems highly unlikely? I read a lot of reviews with these cards. Including other brands/models. All of them are overclocking them with out a issue.