There were 2 primary reasons that IT professionals previously chose the Sun SPARC platform to power their IT infrastructures:
Performance of the hardware
Robustness of the Solaris operating system
As price, performance, and reliability of industry-standard x86_64 servers have increased to the point where they can meet and exceed these features, the reasons to continue buying SPARC hardware have become less compelling. Similarly, Linux®—in particular Red Hat® Enterprise Linux—has emerged as the operating system of choice to leverage the benefits of an open, industry-standard architecture.