Dual Independent Bus is a processor architecture

CPU design

CPU design is the design engineering task of creating a central processing unit , a component of computer hardware. It is a subfield of electronics engineering and computer engineering.- Overview :CPU design focuses on these areas:...

 that includes two buses: one to the main system memory and another to the level 2 cache

CPU cache

A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations...

. The processor

Central processing unit

The central processing unit is the portion of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer. The term has been in...

 can access both simultaneously for improved performance.

In Dual Independent Bus (DIB) architecture systems the single system bus

System bus

A system bus is a single computer bus that connects the major components of a computer system. The technique was developed to reduce costs and improve modularity....

 is replaced by a back-side bus for accessing level 2 cache, and a front-side bus for communicating data between the CPU and main memory and input and output devices.