Processor-in-memory

A Processor-in-memory (PIM) refers to a computer processor tightly coupled to memory, generally on the same silicon chip. Notable PIM projects include the UC Berkeley IRAM or Notre Dame PIM efforts.

The chief goal of merging the processing and memory components in this way is to reduce memory latency and increase bandwidth. Alternatively reducing the distance that data needs to be moved reduces the power requirements of a system. Much of the complexity (and hence power consumption) in current processors stems from strategies to deal with avoiding memory stalls.

In the 1980's, the CPU that executed FORTH by a company call Novix made a cpu integrated with a DRAM to improve PUSH and POP. FORTH is a stack based language and this improved it's efficiency. Some of the Forth CPUs were implemented in FPGAs also.