Heat dissipation is an important factor affecting the efficient operation of computer systems. The PCI card in the existing computer system is a major heating component, such as a video card. In general, PCI graphics cards will have a fan or other heat dissipating components.Because these heat dissipating components are limited by the space of the PCI graphics card itself, they cannot be made very large.Therefore, when the PCI graphics card is running efficiently, the heat dissipating components on the PCI graphics card often cannot meet its heat dissipating requirements.In this case, additional heat dissipating components are needed to ensure the normal operation of the PCI graphics card.

In practical application, several PCI slots are usually idle in the computer system.if cooling fan can be set to cool the PCI graphics card by using the space above these idle PCI slots, the cooling problem of the above PCI graphics card will be solved.

The computer case comprises a case shell, the side wall in the case shell is provided with a plurality of fixing pieces used for fixing PCI cards, and the computer case also comprises a fan fixing bracket, wherein the fan fixing bracket comprises a bottom plate and a fixing blocking piece connected and fixed with the bottom plate; the middle part of the bottom plate is provided with an opening; the bottom plate is provided with two parallel first slots on two opposite sides of the opening; the fan fixing bracket is fixed on the fixing piece through the fixing blocking piece; and a fan can be adjustably assembled on the first slot of the bottom plate through the locking piece position. According to the scheme, the computer case can adjustably arrange a fan position above the idle PCI slot through the fan fixing bracket with the fixing baffle plate on the computer case to radiate the PCI card.