Increasing memory in your IBM system is a very cost-effective way to help boost performance, allow you to open more applications at once and save time and hassle. Since IBM is responsible for the design, testing, manufacturing and quality of IBM memory, compatibility with your IBM computer is backed by IBM Service and Support.This memory is designed for IBM RISC System/6000 models J30, J40, J50, R30, R40, R4U, R50, G30, G40.