From previews, only the 3.0 gigahertz 940 will be unlocked. The 920 won't overclock, but is expected to have a higher IPC than Agena. I'm hoping it's at least 20%.
I think you meant to say the 920 won't be unlocked. I've heard nothing about that it won't overclock, and based on the overclocks from the 940, I'd bet it'll overclock significantly better than a 9950.