"The SPE is a vector-only processor. Every operation works on multiple data elements in parallel, stored in 128-bit registers. There are no scalar (single-element) registers or operations. Each SPE has 256KB of local storage for both instructions and data. This storage is not a "cache" -- it does not share address space with main memory.
"Communication between elements is also somewhat unusual, although it won't have significant effects on our early explorations of Cell/B.E. development. Data does not need to be managed entirely by the PPE. Each SPE can communicate directly with main memory and furthermore, the SPEs can communicate directly with each other."
