Itanium competed with low-power systems (primarily 4-CPU and small systems) with servers based on x86 processors, and with high-power such as with IBM's POWER architecture and Sun Microsystems' SPARC architecture. Intel shifted Itanium to working with the high-power business and HPC computing, trying to copy x86's successful market (i.e., 1 architecture, many system vendors). The success of the 1st processor version was only with replacing PA-RISC in HP systems, Alpha in Compaq systems and MIPS in SGI systems, but IBM also made a supercomputer based on this architecture.