The other factor is the increased bus width.
Accessing an individual byte frequently requires reading or writing the full bus width (a word) at once.
Each 74181 had a bus width of four bits, hence the popularity of bit-slice architecture.
His snapped shot is powerful but approximately two bus widths wide of the goal.
Ultra2 was also the last type to have a "narrow," or 8-bit, bus width.
However there have been several updates to the system to allow wider bus widths.
Multi-channel configurations with a standard 64-bit line size require at least one physical memory chip for each 64 bits of bus width.
On 32-bit processors, external data bus width continues to increase.
However where the bus width is not constant, it is sometimes necessary to provide special termination for the high byte and the associated parity bit.
Futurebus+ supports bus widths from 32 to 256 bits.