I talked a friend of mine into letting me build him a machine with a 2400-m and an NF7-S. His would only do 2.1 GHz, while mine ran 2.3. I later gave him $50 dollars for his and got him a 2600-m which is running 2.3 GHz with 1.6v. I got another 2600-m for my plain NF7, and it's identical to his at lower voltages. I tried mine at extremes (case open and big fan blowing in) and got it stable at 2.6 GHz at ~1.8v. I also tried his old 2400-m in my board, and it still wouldn't run stable above 2.1 GHz at high or low voltage.