From the link in the original post:
• All older (READ: those shipped in February 2012 - 2B models) Catleap monitors seem to hit 85hz+ (97hz 100hz+ being the highest so far, which is the GPU's limit at this resolution).
• Newer Catleaps seem to have a top OC limit of 65-67hz. Very few people have received OC-ready Catleaps in March 2012.