Pentium III mobile modules are small circuit boards with a CPU, 82443BX north bridge, voltage regulator and MMC-2 connector. The 82443BX north bridge on the module integrates SDRAM memory controller, PCI and AGP bus interfaces. The CPU on the mobile module is a mobile Pentium III. Main features of these mobile processors are: 32 KB level 1 cache, integrated 256 KB level 2 cache, 100 MHz FSB frequency, support for SSE technology, Quick Start and other power-saving modes. Many mobile modules also support SpeedStep technology. The mobile module requires 12 Volt power supply - this voltage is converted by on-module voltage regulator to voltage required by the CPU (usually 1.6V), nortbridge chip and other module circuitry.