The back of the PCB is not much interesting but I happened to find out this relatively surprising marking near on of the screw holds which mentions “256″. Its hard to say what this means but we did hear a 256-bit bus being used on the GeForce GTX 880 and with a similar memory configuration as the GeForce GTX 880 on the front end, this might indeed be a conformation for a 256-bit bus being used on NVIDIA’s latest flagship Maxwell card how-ever, its wise to wait for more official and concrete specs but sometimes, speculation does turn out to be true.