The Intel Pentium II 266 MHz Processor SL2HE SL2HC is a tested and working CPU with a clock speed of 0.266 GHz. It features a 512 KB L2 cache and a bus speed of 266 MHz, making it suitable for older computers that require a Slot 1 processor. With its Pentium II architecture and single core, this processor is ideal for those looking to upgrade or repair their system with a reliable and efficient component.