That's only true now since the 30 series cards are relatively new. Once the process node improves soon, the yields are going to go up, and they're going to use

That's only true now since the 30 series cards are relatively new. Once the process node improves soon, the yields are going to go up, and they're going to use fully functioning parts to create mining cards. It happens everytime where they first use parts with defects to create lower end GPUs or CPUs, and then yields improve so they disable the extra cores, memory and restrict frequency in firmware and drivers. There were many hacks in the past to revert these nerfs and get more functionality of higher end products for free. On one graphics card in the past, all you had to do was just flash the higher end card's bios, and it had a success rate of 75%