CoreFreq
CPU monitoring and tuning software designed for the 64-bit processors
...It provides BIOS-like visibility into CPU behavior, including frequencies, ratios, topology, temperatures, power, and performance counters. CoreFreq is useful for Linux users who need deep hardware insight for tuning, benchmarking, diagnostics, or overclocking research. Its main value is giving advanced users detailed processor telemetry through a specialized driver, daemon, and command-line interface.