Independent graphics card system, computer host and computer

A discrete graphics card system comprises an expansion mainboard, a system power supply, at least one expansion graphics card and a fan assembly, the system power supply is electrically connected with the expansion mainboard, the expansion graphics card is inserted into the expansion mainboard through an adapter card, and the expansion graphics card is parallel to the expansion mainboard. And the fan assembly is used for cooling the extended graphics card. In addition, the invention further provides a computer host and a computer with the independent graphics card system. 一种独立显卡系统，其包括一扩展主板、系统电源、至少一个扩展显卡以及风扇组件，所述系统电源与所述扩展主板电连接，所述扩展显卡通过转接卡插接到所述扩展主板，且所述扩展显卡与所述扩展主板平行设置，所述风扇组件对所述扩展显卡进行散热。另外，本发明还提供一种具有该独立显卡系统的计算机主机和计算机。