Featuring single- and multithreaded execution, the POWER5 provides higher performance in the single-threaded mode than its POWER4 predecessor at equivalent frequencies. Enhancements include dynamic resource balancing to efficiently allocate system resources to each thread, software-controlled thread prioritization, and dynamic power management to reduce power consumption without affecting performance.The POWER5 processor supports the 64-bit PowerPC architecture. A single die contains two identical processor cores, each supporting two logical threads. This architecture makes the chip appear as a four-way symmetric multiprocessor to the operating system.POWER5 was design to maintain both binary and structural compatibility with existing POWER4 systems to ensure that binaries continue executing properly and all application optimizations carry forward to newer systems.