AMD/ATI never used 192 bit-True. But that does not mean they will never use it. I am pretty much certain that it will not be a 128 bit one. Memory bus width is one of the most important characteristics of a GPU. Increasing clock speed won't just do the job. It is just like increasing the memory frequency of RAM instead of making dual channel. You will be never able to achieve the bandwidth of dual channel memory using single channel unless it is overclocked from say 1600 MHz to 2600 MHz.