In this paper, the authors provide an insightful comparison between three of the most popular and widely-used Reduced Instruction Set Computing architecture (RISC) processors-MIPS, ARM and SPARC. In order for the reader to acknowledge the differences between those three architectures and fully understand the significance of each one, a comparison between the three architectures is very important. Given that MIPS, ARM and SPARC are used in many different applications, this paper provides a comparison to be able to cover as many software and hardware applications used by these three architectures as possible.