The Intel 8008 was a great deal more sophisticated than the 4004, with almost twice the clock speed of the 4004, 3500 transisters compared to the 4004's 2300 transisters, and twice the bus bandwidth. This meant that the 8008 performed at about the same level as the 4004, but with twice the bus bandwidth, and thus, able to perform much more complex calculations that the 4004. Because of this increased capacity, the 8008 was adopted in many mechanical devices, and a dedicated computer hobbyist, Don Lancaster, used the 8008 to power one of the first predecessors of the personal computer, called a TV-typewriter by Radio Electronics magazine.
Die shot of the Intel 8008 (click to enlarge)