The AB’s GPU clockspeed. This chip works just like an AB, I don’t think you have to care about the branding. With large hardware manufacturers (very well possible in companies as large as Qualcomm) branding is often the job of the marketing department, and hardware developers may be unaware of rebrands of their chips. Rebrands are quite common in the production of desktop GPU’s (both AMD and NVIDIA), the reasons for rebranding are generally not publicly known. I won’t be surprised if it happens with other types of chips too.