As I have mentioned above, the IMO-Desk I651U contains a mainboard based on SiS651 chipset. The chipset supports DDR SDRAM working at 100, 133 or 166MHz and Pentium 4 and Celeron processors with 400 or 533MHz FSB frequencies. The CPU voltage regulator of the IMO-Desk I651U doesn’t support processors on the old Willamette core, you can only use Northwood based processors here (the Prescott is not supported for heat dissipation reasons).
The chipset includes integrated SiS315 graphics core that can use up to 64MB of the system RAM as graphics memory. The features of this core are enhanced in the IMO-Desk I651U by means of a SiS301LV companion chip, which is responsible for the DVI output to the LCD panel and for TV-out implementation. By the way, the remarkable feature of the SiS301 chip is the fact that it turns off the LCD panel once the TV-Out is activated.
The South Bridge of the chipset is the SiS962 chip that guarantees support of IDE devices (a HDD and an optical drive), four USB 2.0 ports, 10/100Mbit Ethernet, support for keyboard and mouse. The sound and modem are also implemented in the same South Bridge with the help of a few physical controllers: Realtek ALC650 and PC Tel PCT303. Two more USB ports are not laid out at the rear panel: they are used to connect the card-reader and the IR receiver of the remote control unit.
An external Realtek RTL8801B PCI controller supports two IEEE1394 ports. ITE IT8705F chip is responsible for controlling the fans, for monitoring and supporting the legacy I/O ports.