The ECS PF88 Extreme is a unique motherboard. Its SIS 656 chipset offers users the possibility to purchase CPU add-in cards, called SIMA cards which allow to run a completely different CPU architecture on the motherboard. At the moment SIMA cards are available for Intel Pentium M Socket 479, AMD Socket 754 and AMD Socket 939. Together with the on-board Socket LGA 775 this means that you can run any mainstream CPU available today. However, there are a few BIOS bugs, one allowed us to get a POST screenshot at 6750 MHz.



Link: TechPowerUp